Cell Membrane

Q. What is osmosis and what role does it play during transportation in plants?

Q. Active transport through the plasma membrane occurs through the action of ___.

1. diffusion
2. membrane proteins
3. DNA
4. water

Q. Cell membrane or plasma membrane is described as a selectively permeable membrane. Which of the following statements justify the given fact?

1. Cell membrane allows the entry and exit of some molecules into and out of the cell.
2. It prevents movement of some other molecules, hence it is called as selectively permeable membrane.
3. Both A and B.
4. None of the above

Q. What are the different types of transport? Give examples.

Q. What happens when the plasma membrane of a cell breaks down?

1. Leads to death of cell
2. Cell multiply and form thousands from it
3. Cell start to reproduce
4. None of the above

Q. State whether the following statements are true or false.
Fluidity of a membrane increases as the percentage of unsaturated fatty acids in the phospholipids goes up.

1. True
2. False

Q. What does cell membrane do?

[Review question: Pg. No: 69]

Q.

Name the cell organelles which can be compared to the following:

(a) Transporting channels of the cell

(b) Packaging and dispatching unit of the cell

(c) Control room of the cell

Q. In the cell membranes, lipids are arranged as:

1. bilayers
2. monolayers
3. trilayers
4. random layers

Q. Which one of the following is found both in the cell of a mango plant and a monkey?

1. Chloroplasts
2. Centrioles
3. Cell wall
4. Cell membrane

Q. Shape of a cell depends on the ____ of the cell.​

1. function
2. habitat
3. size

Q. Which among the following controls the movement of substances in and out of the cell?

1. Cytoplasm
2. Cell membrane
3. Mitochondrion
4. Nucleus

Q. Which among the following controls the movement of substances in and out of the cell?

1. Mitochondrion
2. Cytoplasm
3. Cell membrane
4. Nucleus

Q.

What will happen to the grapes if they are kept in honey?

1. They will remain the same.

2. They will shrink.

3. They will swell up.

4. They will burst.

Q. I am the outer most layer of an animal cell. Who am I?

[Review question: Pg. No: 67]

1. Cell wall
2. Nuclear membrane
3. Cell membrane
4. Nucleus

Q. The barrier between the protoplasm and outer environment in a plant cell is

1. Cell membrane
2. Nuclear membrane
3. Cell wall
4. Tonoplast