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B
Phototropism.
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C
Photoperiodism.
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D
Photosynthesis.
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Solution
The correct option is D Photorespiration.
Photorespiration is a process in which, during water stress conditions, oxygen starts inhibiting Calvin cycle. Photorespiration takes place in the chloroplast, peroxisomes and mitochondria. In the first step in chloroplasts, glycolate is formed which enters peroxisomes where oxygen is converted into hydrogen peroxide and glycine is formed which enters mitochondria where carbon dioxide is released.