Answer:
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Respiration: 1 Mark each
1. In plants different parts can take independently take in oxygen and give out carbon dioxide. Leavestake in oxygen from the air and give out carbon dioxide through tiny pores called stomata.
2. In the cells, thisoxygen is used to break down glucose into carbon dioxide and water with the release of energy.
3. Like all living cells roots also need oxygen to generate energy. Roots take up air from the air spaces present between the soil particles.