Question

true or false
1. Plants can be de-starched by keeping in dark for 72 hours
2.2. Deplasmolysis occurs when a cell is placed in water.

3. Passive absorption requires energy.

4. Phloem is responsible for ascent of sap.

5. Transpiration takes place only in green plants

6. The upper surface of the leaves transpires more.

7. The wall of guard cells towards the stomata is thin.

8. Leaves are reduced to spines in xerophytic plants.

9. Loss of water droplets is called bleeding.

10. The rate of transpiration will be more if the air is humid.

11. The escape of plant sap from the cut surface is called guttation.

12. Transpiration will be more in dim light.

13. Thick cuticle reduces transpiration.

14. Lenticels can open and close.

15. Transpiration pull is one of the causes responsible for ascent of sap

16. Land plants obtain their carbon dioxide from the atmosphere.

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Answer 1

Answer:

1:false

2:true

3:true

4:false

Answer 2

1. True.

2. True (hypotonic solution).

3. False, because it doesn't requires energy active absorption requires energy.

4. False, xylem responsible for ascent of sap.

5. True.

6. True.

7. False, inner wall towards the stomata is thick.

8. True, it is called phylloclade present in xerophytic plants like opuntia.

9. False, it is called guttation.

10. False, transpiration will be less if the air is more humid.

11. False, it is called bleeding.

12. False, because due to dim light stomata will be closed which results in less transpiration.

13. True.

14. False, lenticels are always open.

15. True.

16. True.