Answerof no.4 and 5

4. Chlorophyll in a leaf is required for  

(a) breaking down water into hydrogen and oxygen.
(b) emitting green light.                                                (c) trapping light energy.
(d) storing starch in the leaves.

5. If the rate of respiration becomes more than the rate of photosynthesis, plants will :

(a) continue to live, but will not be able to store food.
(b) be killed instantly.
(c) grow more vigorously because more energy will available.
(d) stop growing and die gradually of starvation.

Dear student 
  • Answer option ( C ) is corrrect for the question no. 4 this is because Chlorophyll is a light sensitive pigment found in thylakoid membrane of chloroplast. It is responsible for trapping light rays comming from sun, which is essential for conversion of CO2 to glucose, glucose is a food prepared during the process of photosynthesis. 
  • Answer option ( D ) is correct for question no. 5 this is because if the rate of respiration is greater than the rate of photosynthesis, then plant will utilize its own biomolecule to compensate the loss which is arises due to decrease in rate of photosynthesis. Which results in gradual increase in starvation, plant stop gowing and ultimately die.
Hope this will clear your doubts about the topic.


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