Cell class 9 Question paper

The fundamental unit of life Question paper

25 marks

1. A cell will shrink :- (1 X 10)

a. If the concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium

b. If the concentration of water molecules of water molecules in the cell is lower than concentration of water molecules in the surrounding medium

c. If the concentration of water molecules in the cell and in the surrounding medium is the same

d. Concentration of water molecules in the cell and in the surrounding medium does not matter.

2. Find out the incorrect statement :-

a. Osmosis is slow process, occurs down the concentration gradient and does not expend energy

b. Electron microscope uses very high voltage electricity. It uses electromagnets instead of glass lenses and beam of electrons instead of light

c. A semipermeable membrane does not allow both solvent and solute molecules to pass through it

d. Active transport of materials is rapid and usually occurs against the concentration gradient involving carrier proteins and energy in the form of ATP.

3. The idea ‘omnis cellula e cellula’ which means that all living cells arise from pre-existing cells was given by :-

a. Robert Brown

b. Purkinje

c. Rudolf Virchow

d. Schleiden

4. What will be the fate of R.B.Cs when placed in hypertonic solutions?

a. They will shrink

b. They will swell up

c. They will not change form

d. They will burst

5. Which cell organelle is not bounded by a unit membrane?

a. Nucleus

b. Lysosome

c. Endoplasmic reticulum

d. Ribosome

6. Plasma membrane is composed of :-

a. Proteins

b. Lipids

c. Proteins and lipids

d. Proteins, lipids and small fraction of carbohydrates.

7. Give two major differences between compound microscope and electron microscope. (2 X 1)

8. What do you mean by exocytosis? What is its significance? - (3 X 1)

9. What advantages does selective permeability of plasma membrane provide to the cell? (2 X 1)

10. Give atleast two important characteristics of a prokaryotic cell. (3 X 1)

11. Draw a labelled diagram of a plant cell as revealed by an electron microscope. (3 X 1)

12. What happens to R.B.Cs when these are placed in :

(i) hypotonic solution (ii) hypertonic solution (iii) isotonic solution (3 X 1)

13. What is diffusion? What is its significance? (3 X 1)