Unit 2 Chapter 1 (1st Secondary) Biology
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- 1.
In order to screen the composition of a large sized objects under light microscope, they have to be sliced into thin slices , …..
- A.
So that the edge of the diaphragm can just be seen at the perimeter of the field of view.
- B.
So that to allow the light to permit through.
- C.
So that to be within the diameter of the field of view.
- D.
So that to bring the specimen clearly into focus.
Correct Answer
B. So that to allow the light to permit through.Explanation
The correct answer is "So that to allow the light to permit through." Slicing the large-sized object into thin slices allows light to pass through the specimen, which is necessary for observation under a light microscope.Rate this question:
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- 2.
Among the methods innovated by scientists to observe the samples more cleary under light microscope is(are)........
- A.
L. Using dyes to stain certain parts of the sample.
- B.
Ll. Using microscopes with two eyepieces.
- C.
Lll. Changing the level of light.
- D.
LV. (l and lll)
Correct Answer
D. LV. (l and lll)Explanation
Scientists have innovated multiple methods to observe samples more clearly under a light microscope. One method is using dyes to stain certain parts of the sample. This helps to enhance the contrast and make specific structures more visible. Another method is changing the level of light. By adjusting the amount of light, scientists can control the brightness and improve the visibility of the sample. Therefore, the correct answer is lV. (l and lll) as both using dyes to stain certain parts of the sample and changing the level of light are methods innovated by scientists to observe samples more clearly under a light microscope.Rate this question:
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- 3.
Among the disadvantages of using dyes for staining certain parts of the sample is that, dyes …..
- A.
Kill the living sample.
- B.
Prevent light from passing through.
- C.
Affect the focus of the object.
- D.
Affect the resolution of the microscope.
Correct Answer
A. Kill the living sample.Explanation
Dyes used for staining can kill the living sample because they often contain toxic chemicals that can be harmful to living organisms. When the dye is applied to the sample, it can penetrate the cells and disrupt their normal functioning, leading to cell death. This can be a disadvantage when studying live samples or when trying to observe the sample's natural behavior or processes.Rate this question:
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- 4.
Which of the following is the correct sequence of events for the development of cell theory?
- A.
Manufacturing and using simple microscopes → determining that all living organisms are comprised of cells → determining that plants are comprised of cells → understanding that new cells are produced by preexisting cells
- B.
Manufacturing and using simple microscopes → determining that plants are comprised of cells → determining that all living organisms are comprised of cells → understanding that new cells are produced by preexisting cells
- C.
Determining that plants are comprised of cells → determining that all living organisms are comprised of cells → manufacturing and using simple microscopes → understanding that new cells are produced by preexisting cells
- D.
Manufacturing and using simple microscopes → understanding that new cells are produced by preexisting cells → determining that plants are comprised of cells → determining that all living organisms are comprised of cells
Correct Answer
B. Manufacturing and using simple microscopes → determining that plants are comprised of cells → determining that all living organisms are comprised of cells → understanding that new cells are produced by preexisting cellsExplanation
The correct sequence of events for the development of cell theory is as follows: first, manufacturing and using simple microscopes allowed scientists to observe cells. Then, they determined that plants are comprised of cells. Next, they determined that all living organisms are comprised of cells. Finally, they understood that new cells are produced by preexisting cells. This sequence represents the progression of discoveries and observations that led to the development of the cell theory.Rate this question:
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- 5.
In the following figure, what are (A), (B), (C) and (D)?
- A.
A is Robert Hooke’s microscope / B is Leeuwenhoek’s microscope / C is objective lens / D is ocular lens.
- B.
A is Robert Hooke’s microscope / B is Leeuwenhoek’s microscope / C is ocular lens / D is objective lens.
- C.
A is Leeuwenhoek’s microscope / B is Robert Hooke’s microscope / C is objective lens / D is ocular lens.
- D.
A is Leeuwenhoek’s microscope / B is Robert Hooke’s microscope / C is ocular lens / D is objective lens.
Correct Answer
D. A is Leeuwenhoek’s microscope / B is Robert Hooke’s microscope / C is ocular lens / D is objective lens.Explanation
The correct answer states that A is Leeuwenhoek's microscope, B is Robert Hooke's microscope, C is the ocular lens, and D is the objective lens. This means that the figure represents two different microscopes, one belonging to Leeuwenhoek and the other to Hooke. The ocular lens refers to the lens through which the viewer looks, while the objective lens refers to the lens closest to the object being viewed.Rate this question:
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- 6.
If SEM refers to scanning electron microscope and TEM refers to transmission electron microscope. The figure below represents pollen grains and white blood cells under each of the SEM and the TEM. What are A1, A2, B1 and B2?
- A.
A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under TEM / B2 white blood cell under SEM.
- B.
A1 pollen grains under TEM / A2 pollen grain under SEM / B1 white blood cells under TEM / B2 white blood cell under SEM.
- C.
A1 pollen grains under TEM / A2 pollen grain under SEM / B1 white blood cells under SEM / B2 white blood cell under TEM.
- D.
A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under SEM / B2 white blood cell under TEM.
Correct Answer
D. A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under SEM / B2 white blood cell under TEM.Explanation
The correct answer is A1 pollen grains under SEM / A2 pollen grain under TEM / B1 white blood cells under SEM / B2 white blood cell under TEM. This is because SEM refers to scanning electron microscope, which is used to observe the surface of specimens, such as pollen grains. TEM refers to transmission electron microscope, which is used to observe the internal structure of specimens, such as the internal structure of pollen grains. Therefore, A1 represents pollen grains observed under SEM, A2 represents pollen grains observed under TEM, B1 represents white blood cells observed under SEM, and B2 represents white blood cells observed under TEM.Rate this question:
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- 7.
It is known that as little as 51% of the original liver mass can regenerate back to its full size after either surgical removal or chemical injury. This agrees with the views of ------------ opinion.
- A.
Robert Hook
- B.
Matthias Schleiden
- C.
Theodor Schwann
- D.
Rudolf Virchow
Correct Answer
D. Rudolf VirchowExplanation
Rudolf Virchow is the correct answer because he is known for his theory of cellular pathology, which states that all cells arise from pre-existing cells. This theory aligns with the idea that the liver can regenerate because the remaining liver cells are able to divide and multiply to restore the organ to its original size.Rate this question:
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- 8.
Which of the following best defines magnification?
- A.
Magnification is calculated as the magnifying power of the objective lens divided by the magnifying power of the eyepiece.
- B.
Magnification is the number of different structures that can be identified in an image.
- C.
Magnification is the minimum distance apart two objects can be in order for them to appear as separate items.
- D.
Magnification is how much bigger the image is than the actual object.
Correct Answer
D. Magnification is how much bigger the image is than the actual object.Explanation
Magnification refers to the extent by which an image is enlarged compared to the actual object. It measures the increase in size of the image relative to the original size of the object.Rate this question:
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- 9.
Which of the following correctly compares light, scanning electron, and transmission electron microscopes?
- A.
A
- B.
B
- C.
C
- D.
D
Correct Answer
D. D -
- 10.
SEM (Scanning Electron Microscope) is used to study the surface morphology or the outer surface of the object, TEM (Transmission Electron Microscope) of a higher resolution is used to study the main internal features of the object. A, B and C are pictures for red blood cells taken under three types of microscopes.Relate each picture to its corresponding microscope.
- A.
A under SEM / B under TEM / C under light microscope.
- B.
A under light microscope / B under SEM / C under TEM.
- C.
A under light microscope / B under TEM / C under SEM.
- D.
A under TEM / B under SEM / C under light microscope.
Correct Answer
C. A under light microscope / B under TEM / C under SEM.Explanation
The correct answer is A under light microscope / B under TEM / C under SEM. This is because SEM is used to study the surface morphology of an object, and C appears to show the outer surface of the red blood cells. TEM, on the other hand, is used to study the internal features of an object, and B appears to show the internal structure of the red blood cells. A, therefore, must be under the light microscope, as it does not show the surface morphology or internal features of the red blood cells.Rate this question:
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- 11.
The micrograph provided is of a nucleolus in a cell. Which type of microscope is most likely to have been used to produce this image?
- A.
Simple microscope
- B.
Light microscope
- C.
Scanning electron microscope
- D.
Transmission electron microscope
Correct Answer
D. Transmission electron microscopeExplanation
The correct answer is transmission electron microscope. This is because the micrograph shows a detailed image of the nucleolus, which is a substructure within the cell. Transmission electron microscopes use a beam of electrons to pass through the specimen, producing a high-resolution image. This allows for the visualization of internal structures within cells, such as the nucleolus. Simple microscopes and light microscopes do not have the necessary resolution to produce such detailed images. Scanning electron microscopes are used to study the surface of specimens, not internal structures.Rate this question:
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- 12.
In the comparison between light microscope (L.M) and electron microscope (E.M), one of the following comparisons is wrong ……
- A.
L.M depends on light / E.M depends upon a beam of high speed electrons.
- B.
L.M has glass lenses / E.M have electromagnetic lenses.
- C.
L.M has a maximum magnification power of 1500 times / E.M has a magnification power about one million times.
- D.
The electron ray has a longer wave length than the light ray.
Correct Answer
D. The electron ray has a longer wave length than the light ray.Explanation
This statement is incorrect because the electron ray in an electron microscope actually has a much shorter wavelength than the light ray in a light microscope. The shorter wavelength of the electron ray allows for much higher magnification and resolution in an electron microscope compared to a light microscope.Rate this question:
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- 13.
What happens to the image of the light microscope if the ocular lens is 10X and the objective lens is 50X …….
- A.
It will be magnified 500 times.
- B.
It will be magnified 60 times.
- C.
It will be magnified 5000 times.
- D.
It will be unclear.
Correct Answer
A. It will be magnified 500 times.Explanation
When using a light microscope, the total magnification is calculated by multiplying the magnification of the ocular lens (eyepiece) by the magnification of the objective lens. In this case, the ocular lens is 10X and the objective lens is 50X. Therefore, the total magnification is 10X * 50X = 500X. This means that the image will be magnified 500 times compared to the actual size of the object being viewed.Rate this question:
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- 14.
What happens to the image of the light microscope if the ocular lens is 40X and the objective lens is 50X …….
- A.
It will be magnified 90 times.
- B.
It will be magnified 2000 times.
- C.
It will be magnified 200 times.
- D.
It will be unclear.
Correct Answer
D. It will be unclear.Explanation
The total magnification of a light microscope is calculated by multiplying the magnification of the objective lens by the magnification of the ocular lens. In this case, the objective lens has a magnification of 50X and the ocular lens has a magnification of 40X. Therefore, the total magnification is 50X * 40X = 2000X. Since the total magnification is very high, it is likely that the image will be unclear due to limitations in the resolution and quality of the microscope.Rate this question:
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- 15.
Cells differ from each other in the shape, structure and size because …....
- A.
Each kind of cell has its own proteins.
- B.
Each kind of cell has its own sugars and lipids.
- C.
Each kind of cell has to perform different function.
- D.
Each kind of cell has its own chromosomal number.
Correct Answer
C. Each kind of cell has to perform different function.Explanation
Cells differ from each other in terms of shape, structure, and size because each kind of cell has to perform a different function. Different cells in the body have specialized roles and responsibilities, such as nerve cells transmitting signals, muscle cells contracting, and blood cells carrying oxygen. These specialized functions require cells to have specific structures and shapes that enable them to carry out their designated tasks efficiently. Therefore, the variation in shape, structure, and size among cells is a result of their unique functions.Rate this question:
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- 16.
Which of the following is used in electron microscope?
- A.
Electron beams
- B.
Magnetic fields
- C.
Light waves
- D.
Electron beams and magnetic fields
Correct Answer
D. Electron beams and magnetic fieldsExplanation
Electron microscopes use electron beams and magnetic fields to magnify and visualize objects at a much higher resolution than traditional light microscopes. The electron beam is generated by an electron gun and focused onto the specimen using electromagnetic lenses. The magnetic fields are used to control the path of the electron beam and to create the necessary magnification. This combination of electron beams and magnetic fields allows for the detailed examination of small structures and particles at the nanoscale level.Rate this question:
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- 17.
A Hen's cell is .......
- A.
Multicellular.
- B.
One large cell.
- C.
An animal cell having chromoplasts.
- D.
A cell without a nucleus.
Correct Answer
B. One large cell.Explanation
A Hen's cell is one large cell because hens have a unique type of cell called an oocyte. This cell is much larger than typical animal cells and contains all the necessary components for reproduction, including the yolk. The oocyte is responsible for the development of an embryo after fertilization.Rate this question:
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- 18.
In view of current status about the cell theory, it does not hold so good because ……
- A.
It needs modification due to discovery of subcellular structures like chloroplasts and mitochondria.
- B.
It means that all living objects consist of cells whether or not capable of reproducing.
- C.
Some organisms (e.g., viruses) do not have cellular organization
- D.
It means that there is no spontaneous generation of life from inanimate materials.
Correct Answer
C. Some organisms (e.g., viruses) do not have cellular organizationExplanation
The given correct answer states that some organisms, such as viruses, do not have cellular organization. This implies that the cell theory, which states that all living objects consist of cells, is not entirely accurate. This is because viruses are considered to be living organisms, yet they do not possess cells. Therefore, the cell theory needs to be modified to account for the existence of these organisms without cellular organization.Rate this question:
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- 19.
How did Theodor Schwann contribute to the development of cell theory?
- A.
Schwann used a microscope to view a piece of cork that he determined was made up of small compartments he called “cells.”
- B.
Schwann determined that all living organisms are composed of cells.
- C.
Schwann studied plant tissues and determined that plants are composed of cells.
- D.
Schwann used lenses to make simple microscopes that could view living organisms under magnification greater than 200x.
- E.
Schwann stated that the new cells in an organism are produced by preexisting cells.
Correct Answer
B. Schwann determined that all living organisms are composed of cells.Explanation
Theodor Schwann contributed to the development of cell theory by determining that all living organisms are composed of cells. This discovery was a crucial step in the understanding of the fundamental unit of life and laid the foundation for the cell theory.Rate this question:
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- 20.
Which of the following was done by T. Schwann?
- A.
He said that not all plants are made of cells.
- B.
He said that not all animals are made of cells.
- C.
He stated that all living organisms body are composed of cells.
- D.
He stated that the new cells are produced only by other living cells.
Correct Answer
C. He stated that all living organisms body are composed of cells.Explanation
T. Schwann stated that all living organisms' bodies are composed of cells. This implies that every living organism, regardless of whether it is a plant or an animal, is made up of cells. This statement is significant because it supports the cell theory, which states that cells are the basic units of life and that all living things are composed of cells. Schwann's contribution to the cell theory helped to establish the fundamental understanding of the structure and function of living organisms.Rate this question:
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- 21.
What type of image is produced by a scanning electron microscope?
- A.
A black-and-white 3D image
- B.
A full-color 3D image
- C.
A black-and-white 2D image
- D.
A full-color 2D image
Correct Answer
A. A black-and-white 3D imageExplanation
A scanning electron microscope produces a black-and-white 3D image. This is because the microscope uses a beam of electrons to scan the surface of the specimen, and the electrons interact with the atoms in the sample to create a high-resolution image. The resulting image is black-and-white because it is based on the detection of the electrons emitted from the specimen, rather than the reflection of light like in an optical microscope. The 3D aspect of the image is achieved by scanning the electron beam across the surface of the specimen at different angles, allowing for the visualization of the sample's topography.Rate this question:
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- 22.
What did Leeuwenhoek do?
- A.
Looked at cork cells.
- B.
Stated that animals are made of cells.
- C.
Stated that all plants are made of cells.
- D.
Used simple microscope and saw microorganisms.
Correct Answer
D. Used simple microscope and saw microorganisms.Explanation
Leeuwenhoek used a simple microscope and observed microorganisms. This is evident from the statement that he "used a simple microscope and saw microorganisms." This suggests that Leeuwenhoek made significant contributions to the field of microbiology by being one of the first to observe and document microscopic organisms.Rate this question:
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- 23.
What is one exception to the cell theory?
- A.
All living things are composed of one or more units called cells.
- B.
Each cell is capable of maintaining its vitality independent of the rest
- C.
Cells can only arise from other cells
- D.
Cells are highly complex and organized but are all enclosed by a physical, impermeable barrier called cell membrane.
Correct Answer
D. Cells are highly complex and organized but are all enclosed by a pHysical, impermeable barrier called cell membrane. -
- 24.
Which general type of microscope a scientist would be most appropriate to use inorder to view a virus with a diameter of 80 nm.
- A.
Van Leeuwenhoek microscope
- B.
Robert Hooke microscope
- C.
Electron microscope
- D.
Light microscope
Correct Answer
C. Electron microscopeExplanation
An electron microscope would be the most appropriate type of microscope to view a virus with a diameter of 80 nm. This is because electron microscopes use a beam of electrons instead of light to magnify the specimen, allowing for much higher resolution and the ability to visualize objects at the nanoscale. Light microscopes, on the other hand, have a limited resolution and would not be able to clearly visualize a virus of this size. Van Leeuwenhoek and Robert Hooke microscopes are both types of light microscopes and would not be suitable for viewing a virus at the nanoscale.Rate this question:
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- 25.
The first to see a cell (a room), and named it a cell. He looked at a cork, saw a line of cells that reminded him of rooms …..
- A.
Had observed the structures only in plant material.
- B.
Deduced that all living organisms bodies are composed of cells.
- C.
Was the second person to see the cell organelles.
- D.
Was the first to observe the world of microscopic organisms and living cells.
Correct Answer
A. Had observed the structures only in plant material.Explanation
The correct answer is "Had observed the structures only in plant material." This is because the passage states that the person looked at a cork and saw a line of cells, which indicates that they were observing plant material. There is no mention of them observing any other type of organism or material. Therefore, it can be deduced that their observations were limited to plant structures.Rate this question:
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- 26.
Which of the following group of scientists contributed to the cell theory?
- A.
Rudolf Virchow, Albert Einstein, Anton van Leeuwenhoek
- B.
Matthias Schleiden, Theodor Schwann, Rudolf Virchow
- C.
Robert Hooke, Charles Darwin, Anton van Leeuwenhoek
- D.
George Carver, Matthias Schleiden, Charlie Sheen
Correct Answer
B. Matthias Schleiden, Theodor Schwann, Rudolf VirchowExplanation
Matthias Schleiden, Theodor Schwann, and Rudolf Virchow are the scientists who contributed to the cell theory. Matthias Schleiden concluded that all plants are composed of cells, Theodor Schwann concluded that all animals are composed of cells, and Rudolf Virchow proposed that cells can only arise from pre-existing cells. Together, their contributions formed the foundation of the cell theory, which states that all living organisms are composed of cells and that cells are the basic units of life.Rate this question:
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- 27.
Which of the following scientists concluded that all PLANTS are made of cells?
- A.
Matthias Schleiden
- B.
Rudolf Virchow
- C.
Robert Hooke
- D.
Theodor Schwann
Correct Answer
A. Matthias SchleidenExplanation
Matthias Schleiden concluded that all plants are made of cells.Rate this question:
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- 28.
Which of the following is a magnifying power of a light microscope?
- A.
40,000x
- B.
4,000x
- C.
4x
- D.
400x
Correct Answer
D. 400xExplanation
The magnifying power of a light microscope refers to how much larger an object appears when viewed through the microscope compared to the naked eye. The magnifying power is determined by the combination of the objective lens and the eyepiece lens. In this case, the correct answer is 400x, indicating that the object will appear 400 times larger when viewed through the microscope compared to the naked eye.Rate this question:
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- 29.
The micrograph provided is of a cross section of a plant stem. Which type of microscope is most likely to have been used to produce this image?
- A.
Scanning electron microscope
- B.
Light microscope
- C.
Transmission electron microscope
- D.
Simple microscope
Correct Answer
B. Light microscopeExplanation
The correct answer is Light microscope. This is because a light microscope is commonly used to produce images of plant tissues, such as cross sections of plant stems. Light microscopes use visible light to illuminate the sample and magnify the image, allowing for detailed observation of the structure and composition of the plant tissue.Rate this question:
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- 30.
What is one way in which all living things on Earth are alike?
- A.
All living things have hair.
- B.
All living things are made of cells and come from other cells.
- C.
All cells of all living things have chloroplast.
- D.
All living things can move.
Correct Answer
B. All living things are made of cells and come from other cells.Explanation
All living things are made of cells and come from other cells. This is a fundamental characteristic of all living organisms. Cells are the basic building blocks of life and are responsible for carrying out all the necessary functions for survival. They contain genetic material, carry out metabolic processes, and are capable of reproducing. This is a universal trait shared by all living things on Earth.Rate this question:
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- 31.
Which of the following is used to increase the contrast between different parts of sclerenchyma tissue seen under a light microscope whose magnification power of the ocular lens is (X15) where a suitable light passes through it?
- A.
Staining the specimen with a suitable dye
- B.
Increasing the thickness of the specimen
- C.
Using an objective lens of magnification power more than (X100)
- D.
Increasing the magnification power of the microscope to (X3000)
Correct Answer
A. Staining the specimen with a suitable dyeExplanation
Staining the specimen with a suitable dye is used to increase the contrast between different parts of sclerenchyma tissue seen under a light microscope. This is because the dye selectively binds to different components of the tissue, making them more visible and distinct. The increased contrast allows for better observation and analysis of the tissue structure and composition.Rate this question:
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- 32.
Which of the following is not a principle that cell theory is based on?
- A.
Cells are the smallest structures found within an organism.
- B.
All living organisms are made up of one or more cells.
- C.
All cells are made from preexisting cells.
- D.
The basic functional unit of all living organisms is the cell.
Correct Answer
A. Cells are the smallest structures found within an organism.Explanation
The correct answer is "Cells are the smallest structures found within an organism." This statement is not a principle of cell theory because cell theory does not specify the size of cells. Cell theory states that all living organisms are made up of one or more cells, all cells are made from preexisting cells, and the basic functional unit of all living organisms is the cell. However, it does not make any claims about the size of cells.Rate this question:
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- 33.
On studying the surface of a white blood cell, which of the following should be used?
- A.
Light microscope of magnifying power x 2000
- B.
Light microscope of magnifying power x 2500
- C.
Scanning electron microscope of magnifying power x 3500
- D.
Transmission electron microscope of magnifying power x 8900
Correct Answer
C. Scanning electron microscope of magnifying power x 3500Explanation
A scanning electron microscope (SEM) should be used to study the surface of a white blood cell because it provides a high-resolution image of the surface topography. The SEM uses a focused beam of electrons to scan the surface of the sample, and the interaction between the electrons and the sample produces signals that can be used to create a detailed image. The magnifying power of x 3500 indicates that the SEM can magnify the image 3500 times, allowing for a closer examination of the cell surface.Rate this question:
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- 34.
Which technology was essential for the development of the cell theory?
- A.
Telescopes
- B.
Scientific researches
- C.
Freezing techniques
- D.
Microscopes
Correct Answer
D. MicroscopesExplanation
Microscopes were essential for the development of the cell theory because they allowed scientists to observe and study cells in detail. Before the invention of microscopes, cells were not visible to the naked eye, and their existence was not known. The discovery of microscopes and their ability to magnify objects allowed scientists like Robert Hooke and Anton van Leeuwenhoek to observe and describe cells for the first time. This paved the way for the development of the cell theory, which states that all living organisms are composed of cells.Rate this question:
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- 35.
Why are microscopes important when studying most cells?
- A.
Most cells are opaque.
- B.
Most cells found in multiple layers.
- C.
Most body cells are not in a direct contact with the external environment
- D.
Most cells are very small.
Correct Answer
D. Most cells are very small.Explanation
Microscopes are important when studying most cells because most cells are very small. Microscopes allow scientists to magnify and visualize these tiny cells, enabling them to study their structure, function, and other characteristics in detail. Without microscopes, it would be difficult to observe and understand the intricate workings of cells, which are the building blocks of all living organisms.Rate this question:
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- 36.
He advanced the cell theory with his conclusion that cells could only come from other cells. ……
- A.
Antonie Van Leeuwenhoek
- B.
Rudolf Virchow
- C.
Theodor Schwann
- D.
Robert Hook
Correct Answer
B. Rudolf VirchowExplanation
Rudolf Virchow advanced the cell theory with his conclusion that cells could only come from other cells. This conclusion, known as the principle of biogenesis, contradicted the prevailing belief at the time that cells could spontaneously generate. Virchow's work was instrumental in solidifying the concept that all living organisms are composed of cells and that cells are the fundamental units of life.Rate this question:
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- 37.
What type of image is produced when a specimen is viewed with a transmission electron microscope?
- A.
A black-and-white 2D image
- B.
A full-color 3D image
- C.
A black-and-white 3D image
- D.
A full-color 2D image
Correct Answer
A. A black-and-white 2D imageExplanation
When a specimen is viewed with a transmission electron microscope, a black-and-white 2D image is produced. This is because the transmission electron microscope uses a beam of electrons to pass through the specimen, and the resulting image is formed by the interaction of these electrons with the specimen. The electrons are detected and converted into a grayscale image, resulting in a black-and-white representation of the specimen in two dimensions.Rate this question:
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- 38.
From the figure below, what is the name of the scientist who stated this principle in the cell theory?
- A.
Virchow
- B.
Van Leeuwenhoek
- C.
Robert Hooke
- D.
Schwann
Correct Answer
D. SchwannExplanation
The correct answer is Schwann because he was the scientist who stated the principle in the cell theory. The cell theory, which states that all living organisms are composed of cells, was proposed by Matthias Jakob Schleiden and Theodor Schwann in the 1830s. Schwann specifically contributed to the theory by stating that cells are the basic unit of structure and function in all living organisms.Rate this question:
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- 39.
The first man to observe live cells under microscope was …..
- A.
Robert Hooke
- B.
Schleiden
- C.
Leeuwenhoek
- D.
Virchow
Correct Answer
C. LeeuwenhoekExplanation
Leeuwenhoek is the correct answer because he was the first man to observe live cells under a microscope. He was a Dutch scientist who made significant contributions to the field of microscopy. In the 17th century, he designed and built his own microscopes, which were more powerful than any others at the time. Using these microscopes, Leeuwenhoek made numerous observations of microorganisms, including bacteria, sperm cells, and red blood cells. His discoveries revolutionized our understanding of the microscopic world and laid the foundation for the field of microbiology.Rate this question:
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- 40.
Which is not true for the cellular theory?
- A.
Cells are the basic functional units for all living organisms.
- B.
All living organisms are made up of cells.
- C.
Theodor Schwann is one of the scientists that the theory is credited to.
- D.
Some cells arise spontaneously.
Correct Answer
D. Some cells arise spontaneously.Explanation
The cellular theory states that all living organisms are made up of cells and that cells are the basic functional units for all living organisms. Theodor Schwann is one of the scientists credited with the development of this theory. However, the statement "Some cells arise spontaneously" is not true for the cellular theory. According to the theory, cells can only arise from pre-existing cells through cell division.Rate this question:
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- 41.
The beginning unit is always a cell. It starts then from cells …....
- A.
To tissues, to organs, to systems, to organisms.
- B.
To tissues, to systems, to organs, to organisms.
- C.
To systems, to tissues, to organs, to organisms.
- D.
To organs, to organisms, to tissues, to systems.
Correct Answer
A. To tissues, to organs, to systems, to organisms.Explanation
The correct answer is "To tissues, to organs, to systems, to organisms." This answer follows a logical progression from smaller units (cells) to larger units (tissues, organs, systems, organisms). It is a hierarchical order that represents the organization of living organisms.Rate this question:
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- 42.
A student examined some plant cells by light microscope, at the beginning he obtained the figure (A), and then he obtained the figure (B). What did he perform for obtaining the figure (B)?
- A.
He added a certain stain to the specimen
- B.
He changed the light level
- C.
He added ethyl alcohol to the specimen
- D.
He used a lens with a higher magnifying power
Correct Answer
D. He used a lens with a higher magnifying powerExplanation
The student obtained figure (B) by using a lens with a higher magnifying power. This means that he switched to a lens that had a greater ability to magnify the specimen, allowing him to see more detail and obtain a clearer image.Rate this question:
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- 43.
Which two scientists, involved in the development of cell theory, determined that living organisms are made up of cells?
- A.
Virchow and Schwann
- B.
Virchow and Hooke
- C.
Schleiden and Schwann
- D.
Hooke and Van Leeuwenhoek
Correct Answer
C. Schleiden and SchwannExplanation
Schleiden and Schwann were two scientists involved in the development of cell theory. Schleiden concluded that all plants are composed of cells, while Schwann extended this idea to animals, stating that all living organisms are made up of cells. Therefore, the correct answer is Schleiden and Schwann.Rate this question:
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- 44.
The micrograph provided is of the head of an ant. Which type of microscope is most likely to have been used to produce this image?
- A.
Light microscope
- B.
Transmission electron microscope
- C.
Scanning electron microscope
- D.
Simple microscope
Correct Answer
C. Scanning electron microscopeExplanation
A scanning electron microscope (SEM) is most likely to have been used to produce the image of the head of an ant. SEMs use a focused beam of electrons to scan the surface of a sample, creating a detailed 3D image. This type of microscope is particularly useful for studying the surface features of specimens, which is likely why it was used to capture the micrograph of the ant's head. Light microscopes, transmission electron microscopes, and simple microscopes are not typically used for imaging the surface of specimens in such detail.Rate this question:
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- 45.
Which is true for the cellular theory?
- A.
Cells are similar in shape, structure and size.
- B.
The muscular cell can contract and relax.
- C.
The nerve cell is long to transfer electrical impulses along its axon.
- D.
The cell is the basic unit of life.
Correct Answer
D. The cell is the basic unit of life.Explanation
The cellular theory states that the cell is the basic unit of life. This means that all living organisms are composed of cells and that cells are the smallest structural and functional units of life. The other options mentioned in the question, such as cells being similar in shape, structure, and size, the ability of muscular cells to contract and relax, and the long structure of nerve cells to transfer electrical impulses, are all characteristics of specific types of cells, but they do not encompass the overall concept of the cellular theory.Rate this question:
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- 46.
He placed a slice of cork under his microscope and he called the structure observed as 'cell'. The person mentioned is …....
- A.
Antony van Leeuwenhoek
- B.
Matthias Schleiden
- C.
Theodor Schwann
- D.
Robert Hooke
Correct Answer
D. Robert HookeExplanation
Robert Hooke is the correct answer because he is credited with discovering and naming the cell. He placed a slice of cork under his microscope and observed small, box-like structures which he called "cells" because they reminded him of the cells of a monastery. This observation was a significant contribution to the field of biology and laid the foundation for the cell theory.Rate this question:
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- 47.
Which of the following was not a major event in the history of the development of cell theory?
- A.
Hooke viewing the remains of cells in a slice of cork under a microscope
- B.
Schleiden concluding that all plants are comprised of cells
- C.
Van Leeuwenhoek viewing living cells from algae and protists under his microscope
- D.
Schwann identifying that bacteria and viruses were single-celled organisms
- E.
Virchow determining that all cells are produced by preexisting cells
Correct Answer
D. Schwann identifying that bacteria and viruses were single-celled organismsExplanation
The major events in the history of the development of cell theory include Hooke's observation of cells in cork, Schleiden's conclusion about plant cells, Van Leeuwenhoek's observation of living cells, and Virchow's discovery about cell division. Schwann's identification of bacteria and viruses as single-celled organisms is not a major event in the development of cell theory because it is not directly related to the understanding of cells as the basic unit of life.Rate this question:
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- 48.
Which general type of microscope a student would be most appropriate to use inorder to view a living human egg cell (ovum) with a diameter of 100 μm.
- A.
Van Leeuwenhoek microscope
- B.
Robert Hooke microscope
- C.
Electron microscope
- D.
Light microscope
Correct Answer
D. Light microscopeExplanation
A light microscope would be the most appropriate type of microscope to view a living human egg cell because it allows for the visualization of living cells without damaging them. Light microscopes use visible light to illuminate the specimen and magnify it, making it suitable for observing cells and their structures. In contrast, electron microscopes use a beam of electrons to create an image, which can be harmful to living cells. Van Leeuwenhoek and Robert Hooke microscopes are historical types of light microscopes, but they may not have the necessary magnification or resolution to view a human egg cell.Rate this question:
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- 49.
All the following statements are true regarding the "cell theory" except .....
- A.
All living things or organisms are made of cells.
- B.
All cells arise spontaneously.
- C.
Cell is the basic structural and functional unit of life.
- D.
All cells arise from preexisting cells.
Correct Answer
B. All cells arise spontaneously.Explanation
The cell theory states that all living things or organisms are made of cells, that the cell is the basic structural and functional unit of life, and that all cells arise from preexisting cells. Therefore, the statement "All cells arise spontaneously" is not true according to the cell theory.Rate this question:
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- 50.
The smallest unit that can perform the basic activities of life is a(an) …....
- A.
Cell
- B.
Tissue
- C.
Organ
- D.
Organism
Correct Answer
A. CellExplanation
A cell is the smallest unit that can perform the basic activities of life. Cells are the building blocks of all living organisms and are capable of carrying out essential functions such as metabolism, reproduction, and responding to stimuli. They are the fundamental units of life and are responsible for maintaining the overall structure and function of an organism.Rate this question:
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Mar 09, 2023Quiz Edited by
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Aug 01, 2020Quiz Created by
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