Question

Which is correct about the reactions of cellular respiration (CR) and/or photosynthesis (PS)?

		in PS, carbon dioxide is split to make oxygen, and make carbon for sugars
		in both PS and CR, ATP synthase is used to make ATP from ADP and Pi
		in both PS and CR, a proton-motive force is made using breakdown of organic molecules
		in CR, glucose gets reduced to make carbon dioxide
		in both PS and CR, the reactions occur entirely within an organelle

Answer 1

1. Answer: Option B is correct
Explanation:
Photosynthesis involves the reduction of CO2 to carbohydrates. It involves photolysis of water to release oxygen.
Respiration involves sequential oxidation of carbohydrates to CO2 and H2O.

Both respiration and photosynthesis (Light-dependent reactions) utilize a proton gradient to synthesize ATP from ADP+Pi using an ATP synthase complex.

Photolysis of water (Inorganic compound) provides electrons for the establishment of proton gradient during photosynthesis. Oxidation of glucose provides electrons for the establishment of proton gradient during respiration.

In respiration, glucose gets oxidized to CO2.

Respiratory reactions occur in cytoplasm and mitochondria.
Photosynthesis occurs in chloroplast.