Y7 Biology Quiz On Unit 3

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| By Basma Mohamed

Basma Mohamed

Community Contributor

Quizzes Created: 1 | Total Attempts: 52

Questions: 10 | Attempts: 52 | Updated: Jan 20, 2023

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Questions and Answers

1.

This image shows the experiments of Louis Pasteur on micro-organisms. Explain his work briefly.
2.

What controls what enters and exits a cell, and is found in both animal and plant cells?
- A.
  
  Cell vacuole
- B.
  
  Cell membrane
- C.
  
  Cell wall
- D.
  
  Cell thickness
Correct Answer
B. Cell membrane

Explanation
The cell membrane controls what enters and exits a cell, acting as a selective barrier. It is found in both animal and plant cells, making it the correct answer. The cell vacuole is responsible for storing water and other substances, the cell wall provides structural support in plant cells, and cell thickness is not a specific component found in cells.

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3.

The nucleus is found only in animal cells. Is this statement:
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
The statement is false because the nucleus is found in both animal and plant cells. The nucleus is a membrane-bound organelle that contains the cell's genetic material, including DNA. It is responsible for controlling the cell's activities and is present in the cells of both animals and plants.

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4.

Plant cells carry out photosynthesis because hey contain
- A.
  
  Cell wall
- B.
  
  Green color
- C.
  
  Chloroplasts
- D.
  
  Nutrients
Correct Answer
C. Chloroplasts

Explanation
Plant cells carry out photosynthesis because they contain chloroplasts. Chloroplasts are specialized organelles found in plant cells that contain chlorophyll, a pigment responsible for capturing light energy. During photosynthesis, chloroplasts use this light energy to convert carbon dioxide and water into glucose and oxygen. This process is vital for plants as it enables them to produce their own food and release oxygen as a byproduct. Therefore, the presence of chloroplasts allows plant cells to carry out photosynthesis efficiently.

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5.

We use________ to help us make bread, and we use ________ to change milk into yoghurt

Correct Answer
yeast
bacteria

Explanation
Yeast is used to help make bread because it is a type of fungus that ferments the dough, causing it to rise and giving the bread its fluffy texture. On the other hand, bacteria are used to change milk into yogurt through the process of fermentation. The bacteria consume the lactose in the milk and produce lactic acid, which thickens the milk and gives yogurt its tangy flavor and creamy consistency.

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4
6.

The main function of________ is to carry oxygen and that is why they are biconcave in shape.

Correct Answer
red blood cells

Explanation
Red blood cells, also known as erythrocytes, are the correct answer. Red blood cells are responsible for carrying oxygen throughout the body. Their biconcave shape allows for a larger surface area, which facilitates the exchange of oxygen and carbon dioxide. This shape also enables them to be flexible and squeeze through narrow capillaries.

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4
7.

Cell membrane,________ and________ are found in both plant and animal cells.

Correct Answer
nucleus, cytoplasm
nucleus, cytoplasm

Explanation
The cell membrane is a structure found in both plant and animal cells. It acts as a barrier, controlling the movement of substances in and out of the cell. The nucleus is also found in both plant and animal cells and is the control center of the cell, containing the genetic material. The cytoplasm is a gel-like substance that fills the cell and contains various organelles. Therefore, both the nucleus and cytoplasm are found in both plant and animal cells.

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4
8.

The root hair cell is found in the________of________. Its function is to ________ from the ________

Correct Answer
roots
plants
water, water and minerals, minerals
soil

Explanation
Root hair cells are specialized cells found in the roots of plants. Their main function is to absorb water and minerals from the soil. These cells have long, thin projections called root hairs that increase the surface area of the root, allowing for more efficient absorption of water and minerals. This helps the plant to obtain the necessary nutrients for growth and development.

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4
9.

The function of the extension of the root hair cell is to________

Correct Answer
increase surface area for absorption of water from the soil

Explanation
The extension of the root hair cell increases the surface area for absorption of water from the soil. This is because the root hair cells are long and slender, which allows them to penetrate between soil particles. The increased surface area provided by the extensions of the root hair cell allows for more contact with the soil particles, increasing the absorption of water and nutrients. This adaptation is crucial for the plant to efficiently uptake water and nutrients from the soil for its growth and survival.

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4
10.

All body cells have exactly the same structure and function. Is this statement:
- A.
  
  True
- B.
  
  False
Correct Answer
B. False

Explanation
This statement is false. While all body cells share some similarities in structure and function, they are not exactly the same. Different types of cells have specific structures and functions that are necessary for their specialized roles in the body. For example, nerve cells have long extensions called axons that allow them to transmit electrical signals, while muscle cells have unique proteins that enable them to contract and generate force. Therefore, the structure and function of cells vary depending on their type and purpose in the body.

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Current Version
Jan 20, 2023

Quiz Edited by
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Apr 26, 2020

Quiz Created by
Basma Mohamed

Y7 Biology Quiz On Unit 3

This image shows the experiments of Louis Pasteur on micro-organisms. Explain his work briefly.

What controls what enters and exits a cell, and is found in both animal and plant cells?

The nucleus is found only in animal cells. Is this statement:

Plant cells carry out photosynthesis because hey contain

We use to help us make bread, and we use to change milk into yoghurt

The main function of________ is to carry oxygen and that is why they are biconcave in shape.

Cell membrane, and are found in both plant and animal cells.

The root hair cell is found in theof. Its function is to from the

The function of the extension of the root hair cell is to________

All body cells have exactly the same structure and function. Is this statement:

Y7 Biology Quiz On Unit 3

This image shows the experiments of Louis Pasteur on micro-organisms. Explain his work briefly.

What controls what enters and exits a cell, and is found in both animal and plant cells?

The nucleus is found only in animal cells. Is this statement:

Plant cells carry out photosynthesis because hey contain

We use________ to help us make bread, and we use ________ to change milk into yoghurt

The main function of________ is to carry oxygen and that is why they are biconcave in shape.

Cell membrane,________ and________ are found in both plant and animal cells.

The root hair cell is found in the________of________. Its function is to ________ from the ________

The function of the extension of the root hair cell is to________

All body cells have exactly the same structure and function. Is this statement:

We use to help us make bread, and we use to change milk into yoghurt

Cell membrane, and are found in both plant and animal cells.

The root hair cell is found in theof. Its function is to from the