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Question
State the utility of oxygen for respiration in plants
Solution
Respiration in plants:
- Plants respire during the day and night.
- Plants respire through tiny pores on the surface of the leaves called ‘stomata’.
- The stomata help in taking in the oxygen of the air and giving out carbon dioxide. Thus, they function as respiratory organs.
- Plants do not perform bodily activities and hence need less energy than animals. The rate of respiration in plants is thereby slower than in animals.
Photosynthesis in plants:
Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.
- In the leaf of a green plant are present leaf cells which contain chloroplasts in which is present a green pigment called chlorophyll.
- During photosynthesis which occurs during daytime, carbon dioxide and water in the presence of sunlight and chlorophyll is changed into glucose, and oxygen is released out.
\[\ce{Carbon dioxide + Water ->[Sunlight][Chlorophy II]Glucose + Oxygen + Water}\] - Hence oxygen in the air is renewed by photosynthesis and therefore the amount of oxygen in the air does not get depleted or removed from the air.
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