AP BIOLOGY

Detailed explanation-1: -Answer and Explanation: Autotrophs such as plants and algae have chloroplasts, and produce oxygen gas as a waste product, whereas heterotrophs such as animals ingest their food and produce carbon dioxide as a waste product.

Detailed explanation-2: -The chloroplast is involved in both stages of photosynthesis. The light reactions take place in the thylakoid. There, water (H2O) is oxidized, and oxygen (O2) is released. The electrons that freed from the water are transferred to ATP and NADPH.

Detailed explanation-3: -In photosynthesis, solar energy is harvested as chemical energy in a process that converts water and carbon dioxide to glucose. Oxygen is released as a byproduct.

Detailed explanation-4: -Some of the oxygen produced in the process of photosynthesis is used in respiration by the leaf cells but the major portion of it is not required and it diffuses out into the atmosphere through the stomata. Therefore, it may be called a waste product of photosynthesis.