Function of Cell Membrane

Q. Which of the following is a function of plasma membrane?

1. Protect the cell from its surrounding
2. selectively permeable to ions and organic molecules
3. regulates the movement of substances in and out of cells.
4. All of the above

Q. Assertion: Multicellular organisms are made up of multiple cells instead of one.

Reason: Plasma membrane of a single large cell of the organism would not be able to serve the cytoplasm inside it efficiently.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion
2. The assertion is true but reason is false
3. Both the assertion and reason are false
4. The assertion is false but the reason is true

Q.

What purpose(s) does endoplasmic reticulum serve in a cell?

1. It is involved in intracellular transport

2. It protects the internal organelles

3. It provides attachment sites for ribosomes

4. It provides increased surface area inside the cell