Grade 8 Science:Chapter 4 Quiz Cells

2.

Which is not an example of cell theory.

All living things are composed of one or more cells.
The cell is the basic unit of life.
The cells have a life span
All cells come from pre-existing cells

Correct Answer

A. The cells have a life span

Explanation

The statement "The cells have a life span" is not an example of cell theory because cell theory does not address the lifespan of cells. Cell theory focuses on the idea that all living things are composed of cells, the cell is the basic unit of life, and all cells come from pre-existing cells. The lifespan of cells is a separate concept that is not directly related to the principles of cell theory.

Rate this question:

1

3.

What is the maximum magnification of the microscope used in the science lab?

100X
400X
600X
1000X
4000X

Correct Answer

A. 400X

Explanation

The maximum magnification of the microscope used in the science lab is 400X. This means that the microscope can enlarge an object up to 400 times its actual size. This level of magnification is commonly used in scientific research and allows for detailed observation of microscopic organisms and structures.

Rate this question:

1

4.

When magnifying an object the field of view does the following:

Decreases in size.
Stays the same size.
Increases in size.

Correct Answer

A. Decreases in size.

Explanation

When magnifying an object, the field of view decreases in size. This is because when we magnify an object, we are essentially zooming in on a smaller portion of the object, which results in a narrower field of view. As we increase the magnification, the area that we can see becomes smaller and more focused, leading to a decrease in the overall size of the field of view.

Rate this question:

5.

Which organelles are only found in the plant cell?

Cell wall, chloroplasts, cytoplasm, vacuole
Cell wall, chloroplasts, flagella, vacuole
Cell wall, chloroplasts, cilia, vacuole

Correct Answer(s)

A. Cell wall, chloroplasts, cytoplasm, vacuole
A. Cell wall, chloroplasts, flagella, vacuole

Explanation

The correct answer is "Cell wall, chloroplasts, cytoplasm, vacuole." The cell wall is a rigid structure found only in plant cells that provides support and protection. Chloroplasts are organelles responsible for photosynthesis, which is a process unique to plant cells. Cytoplasm is a jelly-like substance that fills the cell and is found in all types of cells, including plant cells. Vacuoles are large membrane-bound sacs that store water, nutrients, and waste materials, and they are more prominent in plant cells compared to animal cells. The other options include flagella and cilia, which are structures involved in cell movement, but they are not specific to plant cells.

Rate this question:

1

6.

Which is not an example of an organelle?

Nucleus
Chromosome
Vacuole
Cytoplasm

Correct Answer

A. Cytoplasm

Explanation

The cytoplasm is not an example of an organelle. Organelles are specialized structures within a cell that perform specific functions. The nucleus, chromosome, and vacuole are all examples of organelles. The nucleus contains the cell's genetic material, chromosomes are structures within the nucleus that carry genes, and vacuoles are membrane-bound organelles involved in storage and waste disposal. On the other hand, the cytoplasm is the gel-like substance that fills the cell and surrounds the organelles. While it plays a crucial role in supporting the organelles, it is not considered an organelle itself.

Rate this question:

0

7.

Which organelle is found in the lungs of humans and assists to get dust out.

Cilia
Flagella
Chloroplast
Lysosome

Correct Answer

A. Cilia

Explanation

Cilia are small hair-like structures found in the lungs of humans that help to remove dust particles and other foreign substances. These tiny projections beat in coordinated motions, creating a sweeping motion that moves mucus and trapped particles out of the respiratory system. This action helps to keep the lungs clean and prevents harmful substances from entering deeper into the respiratory tract.

Rate this question:

1

8.

Which organelle is not found in the plant cell?

Mitochondria
Lysosome
Cell membrane
Flagella
All are found in plant cell

Correct Answer

A. All are found in plant cell

Explanation

All of the listed organelles (mitochondria, lysosome, cell membrane, and flagella) are found in plant cells. This means that there is no organelle that is not found in a plant cell.

Rate this question:

9.

Which organelle can only be seen using an electron microscope?

Mitochondria
Vacuoles
Chromosomes
Chloroplast

Correct Answer

A. Mitochondria

Explanation

Mitochondria can only be seen using an electron microscope because they are very small and have a complex internal structure. Electron microscopes use a beam of electrons to create an image, which has a higher resolution than light microscopes. This allows for the visualization of smaller structures like mitochondria. Vacuoles, chromosomes, and chloroplasts can be seen using both light and electron microscopes, as they are larger and more easily observable.

Rate this question:

10.

Todays electron microscopes can magnify an object up to

2 00 000X
2 000 000X
20 000 000X
200 000 000X

Correct Answer

A. 2 000 000X

Explanation

Today's electron microscopes can magnify an object up to 2,000,000X.

Rate this question:

2

Grade 8 Science:Chapter 4 Quiz Cells

A plant grows roots in the direction of moist soil. What is this an example of?

Which is not an example of cell theory.

What is the maximum magnification of the microscope used in the science lab?

When magnifying an object the field of view does the following:

Which organelles are only found in the plant cell?

Which is not an example of an organelle?

Which organelle is found in the lungs of humans and assists to get dust out.

Which organelle is not found in the plant cell?

Which organelle can only be seen using an electron microscope?

Todays electron microscopes can magnify an object up to