Question

how is the energy from sunlight used in the light - dependent reactions? a. it converts glucose into oxygen. b. it synthesizes glucose directly from water. c. it excites electrons in chlorophyll, which then generate atp and nadph. d. it splits carbon dioxide into oxygen and carbon.
which gas is released as a by - product of photosynthesis? a. carbon dioxide b. nitrogen c. oxygen d. hydrogen
how do stomata function in the process of photosynthesis? a. they absorb light energy. b. they allow carbon dioxide to enter the plant and oxygen to exit. c. they store water for the plant. d. they transport glucose throughout the plant.

Explanation:

1. In light - dependent reactions of photosynthesis, sunlight energy excites electrons in chlorophyll, which then generate ATP and NADPH. Glucose is not directly synthesized from water in light - dependent reactions, and carbon dioxide is not split into oxygen and carbon in this context either.
2. During photosynthesis, plants use carbon dioxide and water to produce glucose and oxygen. Oxygen is released as a by - product.
3. Stomata are small pores on plant leaves. They allow carbon dioxide, which is needed for photosynthesis, to enter the plant and oxygen, a by - product of photosynthesis, to exit the plant.

Answer:

1. c. It excites electrons in chlorophyll, which then generate ATP and NADPH.
2. c. Oxygen
3. b. They allow carbon dioxide to enter the plant and oxygen to exit.