Question

in which part of the chloroplast do light - dependent reactions occur? a. thylakoid membranes b. cytoplasm c. stroma d. mitochondrial membrane what pigment is primarily responsible for capturing light energy during photosynthesis? a. xanthophyll b. carotene c. chlorophyll d. melanin how is the energy from sunlight used in the light - dependent reactions? a. it synthesizes glucose directly from water. b. it converts glucose into oxygen. c. it excites electrons in chlorophyll, which then generates atp and nadph. d. it splits carbon dioxide into oxygen and carbon

Explanation:

1. Light - dependent reactions in chloroplasts occur in the thylakoid membranes. These membranes contain photosystems and electron - transport chains necessary for capturing light energy.
2. Chlorophyll is the primary pigment responsible for capturing light energy during photosynthesis. It absorbs light in the red and blue regions of the spectrum.
3. In the light - dependent reactions, sunlight excites electrons in chlorophyll. This energy is used to generate ATP and NADPH through a series of electron - transfer and proton - pumping processes.

Answer:

1. a. Thylakoid membranes
2. c. Chlorophyll
3. c. It excites electrons in chlorophyll, which then generates ATP and NADPH.