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A plant gets light and water but does not get carbon dioxide. Which process will decrease first?

Answer and explanation

Correct answer: Photosynthesis

Carbon dioxide is a reactant in photosynthesis; it is used with water and light energy to form carbohydrates. If carbon dioxide is unavailable, carbon fixation in the Calvin cycle cannot proceed normally, even though light and water are present. Therefore the rate of photosynthesis and food formation decreases first. Transpiration, water absorption, and mineral transport may be affected indirectly later, but they are not the directly blocked process. Option B is correct.

Related tags

PhotosynthesisCarbon DioxideCarbon FixationLife ProcessesWorld Of LivingScienceClass 10 Mcq

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