Question

19 use your knowledge of science to answer the question. which statements describe steps in photosynthesis? select the three correct answers. a energy is used to convert carbon dioxide and water into sugar. b energy in the form of heat is used to absorb carbon dioxide. c glucose is broken down into carbon dioxide and water. d organic matter and oxygen combine to break molecules into smaller parts. e water is broken apart to produce oxygen. f energy is stored in the bonds of atp. g light energy is absorbed by chlorophyll.

Explanation:

• Option A: Photosynthesis uses light energy to convert \( \ce{CO_2} \) and \( \ce{H_2O} \) into glucose (sugar), so this is a step.
• Option E: In the light - dependent reactions of photosynthesis, water is split (photolysis) to produce oxygen, protons, and electrons.
• Option G: Chlorophyll in chloroplasts absorbs light energy, which is the first step in capturing energy for photosynthesis.

Options B is incorrect as heat energy is not used to absorb \( \ce{CO_2} \) in photosynthesis. Option C describes cellular respiration (breakdown of glucose), not photosynthesis. Option D also describes cellular respiration (oxidation of organic matter). Option F: While ATP is involved, the main energy storage in photosynthesis - related energy capture is in the formation of glucose, and the description of energy storage in ATP is not a core step description of photosynthesis compared to A, E, G.

Answer:

A. Energy is used to convert carbon dioxide and water into sugar.
E. Water is broken apart to produce oxygen.
G. Light energy is absorbed by chlorophyll.