Science
(i) State the role of ATP in cellular respiration.
(ii) What ensures sufficient exchange of gases in plants?
(iii) State the conditions on which the direction of diffusion of gases in plant depend upon.
Plants Respiration
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Answer
(i) ATP is consumed in glycolysis to convert glucose to pyruvate. It is also produced in electron transport chain.
(ii) Maximum amount of gaseous exchange occur in plants through stomata and lenticels present on leaf and stem surface respectively and the large inter-cellular spaces ensure that all cells are in contact with air.
(iii) The direction of diffusion depends upon the environmental conditions and the requirements of the plant. At night, when there is no photosynthesis occurring, CO2 elimination is the major exchange activity going on. During the day, CO2 generated during respiration is used up for photosynthesis, hence there is no CO2 release. Instead, oxygen release is the major event at this time.
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