Question

1. during the light - dependent reactions, how does chlorophyll replace the electrons it loses after being energized by sunlight?

a) it absorbs electrons from atp molecules. b) it steals electrons from carbon dioxide molecules.
c) it generates new electrons through a chemical synthesis process. d) it takes electrons from water molecules, leading to oxygen release.

1. where do the light - dependent reactions of photosynthesis primarily occur, and what are their main products?

a) stroma: glucose and oxygen b) mitochondria: atp and carbon dioxide
c) cytoplasm: carbon dioxide and water d) thylakoids: atp, nadph, and oxygen

1. what is the primary location within the chloroplast where the light - independent reactions (calvin cycle) take place, and what atmospheric gas is fixed during this process?

a) stroma; carbon dioxide b) outer membrane; water vapor
c) granum; nitrogen d) thylakoid membrane; oxygen

1. what is the basic sugar molecule produced at the end of the calvin cycle, and what are some of its subsequent uses within the plant?

a) fructose; stored as lipids and used for dna synthesis. b) ribose; primarily used for atp production in respiration.
c) sucrose; used for immediate energy and protein synthesis. d) g3p; converted into complex sugars like cellulose and starch, or used to make fatty acids and amino acids.

Explanation:

• Question 5: In the light - dependent reactions, water is split (photolysis) to release electrons, protons, and oxygen. Chlorophyll gets electrons from water.
• Question 6: The light - dependent reactions occur in the thylakoid membranes of chloroplasts. The products are ATP (energy carrier), NADPH (electron carrier), and oxygen (by - product from water splitting).
• Question 7: The Calvin cycle (light - independent reactions) occurs in the stroma of the chloroplast. Carbon dioxide is fixed (incorporated into organic molecules).
• Question 8: Glyceraldehyde - 3 - phosphate (G3P) is the basic sugar product of the Calvin cycle. It can be converted into more complex sugars (e.g., cellulose, starch) or used in the synthesis of fatty acids and amino acids.

Answer:

1. d) It takes electrons from water molecules, leading to oxygen release.
2. d) Thylakoids; ATP, NADPH, and Oxygen
3. a) Stroma; Carbon dioxide
4. d) G3P; Converted into complex sugars like cellulose and starch, or used to make fatty acids and amino acids.