Q37 of 79 Page 54

How do the guard cells regulate opening and closing of stomatal pores?

The guard cells regulate the opening and closing of stomatal pores. They swell, when water flows into the guard cells and stomatal pores get opens. Similarly, when the guard cells lose water, they shrink, become straight and the stomatal pores get closed.


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35

Name the following:

(1) The process in plants that links light energy with chemical energy
(2) Organisms that can prepare their own food


(3) The cell organelle where photosynthesis occurs


(4) Cells that surround a stomatal pore


(5) Organisms that cannot prepare their own food


(6) An enzyme secreted from gastric glands in stomach that acts on proteins.

 36

“All plants give out oxygen during day and carbon dioxide during night”. Do you agree with this statement? Give reason.

 38

Two green plants are kept separately in oxygen free containers, one in the dark and the other in continuous light. Which one will live longer? Give reasons.

 39

If a plant is releasing carbon dioxide and taking in oxygen during the day, does it mean that there is no photosynthesis occurring? Justify your Solution.