The part of an exercise program when the activity is performed at its highest peak

Ans. (d). photosynthesis occurs in mitochondria.

Plants are autotrophic, eukaryotic organisms that synthesize their own food, by the process of photosynthetic. This process involves absorption sun light as energy source by chlorophyll molecules present in plant leaves and green stems.

Photosynthesis takes plant in chloroplasts, not in mitochondria. Thus, the correct answer is option (d).