Question

what is the main product of the light - dependent reactions?
a. glucose
b. water
c. carbon dioxide
d. oxygen

where does photosynthesis primarily take place in plant cells?
a. nucleus
b. cytoplasm
c. chloroplasts
d. mitochondria

in which part of the chloroplast do light - dependent reactions occur?
a. mitochondrial membrane
b. thylakoid membranes
c. stroma
d. cytoplasm

Explanation:

1. In light - dependent reactions of photosynthesis, water is split and oxygen is released as a by - product. Glucose is a product of the Calvin cycle (light - independent reactions). Water and carbon dioxide are reactants in photosynthesis.
2. Photosynthesis primarily occurs in chloroplasts in plant cells. The nucleus contains genetic material, the cytoplasm is the general cell matrix, and mitochondria are for cellular respiration.
3. Light - dependent reactions occur in the thylakoid membranes of chloroplasts. The mitochondrial membrane is involved in cellular respiration, the stroma is for light - independent reactions, and the cytoplasm is not the site of light - dependent reactions in chloroplasts.

Answer:

1. d. Oxygen
2. c. Chloroplasts
3. b. Thylakoid membranes