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.
Frequently asked questions
What is the correct answer to this question?
Photosynthesis
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: World of Living. Topic: Life Processes.
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