Biology 11 Chapter - 10 Form and Function in Plants -8

Biology 11 Chapter - 10
Form and Function in Plants -8

1. Guard cells are the cells of?

a) Stomata
b) Xylem
c) Phloem
d) Meniscus

2. Co2 reacts with water in the guard cells to form?

a) Carbonic acid
b) Lactic acid
c) Fatty acid
d) Alcohol

3. The guard cells become turgid with water due to?

a) High concentration of sugar
b) Low concentration of sugar
c) High concentration of fats
d) Low concentration of fats

4. The condition in which the guard cells become limp, soft and weak is known as?

a) Flaccidity
b) Turgidity
c) Transpiration
d) Osmosis

5. Loss of water is prevented when the stomata are?

a) A. Closed
b) B. Opened
c) C. Large in number
d) D. B and c are correct

6. Potassium ions enter guard cells from the surrounding epidermal cells by?

a) Active transport
b) Passive transport
c) Diffusion
d) Osmosis

7. When the potassium ions are accumulated, the osmotic potential of the guard cells?

a) Decreases
b) Increases
c) Does not affected
d) Becomes constant

8. Water enters the guard cells by?

a) A. Osmosis
b) B. Active transport
c) C. Passive transport
d) D. B and c are correct

9. The loss of pressure in the guard cells results in the?

a) Closing of stomata
b) Opening of stomata
c) Both of these
d) None of these

10. Aphids are known as?a) Phloem feeders
b) Insect feeders
c) Meat feeders
d) Blood feeders

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