(a) List the three events that occur during the process of photosynthesis. Explain the role of
stomata in this process.
(b) Describe an experiment to show that “sunlight is essential for photosynthesis”.
Answers
Explanation:
(a) Three most important steps of photosynthesis are:
Absorption of light energy by chlorophyll
Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen
Reduction of carbon dioxide to carbohydrates.
(b) Experiment to prove that “sunlight is essential for photosynthes” is explained below:
(i) Select two healthy plants.
(ii) Keep them in a dark room for 3 days.
(iii) Now place them in different air tight chambers, one supplied with potassium hydroxide, which is used to absorb carbon dioxide.
(iv) Now keep the plants in sunlight for 2 hours.
(v) Pluck leaf from both plants and check the presence of starch.
(vi) Higher starch content in the jar with potassium hydroxide indicates that in the presence of light the photosynthesis have occurred so higher starch content is found.
a) stomata open and takes in carbon dioxide
it then takes sunlight
and using chlorophyll makes food for the plant
b) (not for experimenting)
if a person sits under a peepal tree during night when it doesn't photosynthesise, the person under it dies due to lack of oxygen produced during photosynthesis
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