Understanding Light Dependent Reactions

What is the primary function of Photosystem I?

• To capture light energy for ATP synthesis.

• To transport electrons to Photosystem II.

• To produce oxygen as a byproduct of photosynthesis.

• To facilitate the reduction of NADP+ to NADPH.

How does Photosystem II contribute to the light dependent reactions?

• Photosystem II captures light energy to produce chlorophyll.

• Photosystem II captures light energy to split water, releasing oxygen and generating ATP and NADPH.

• Photosystem II generates energy by breaking down glucose.

• Photosystem II absorbs carbon dioxide to produce glucose.

What role does ATP synthase play in ATP synthesis?

• ATP synthase is involved in the degradation of glucose.

• ATP synthase catalyzes the synthesis of ATP from ADP and inorganic phosphate using a proton gradient.

• ATP synthase transports protons across the mitochondrial membrane.

• ATP synthase breaks down ATP into ADP and phosphate.

Describe the process of NADPH production in the light dependent reactions.

• NADPH is produced by the reduction of NADP+ using high-energy electrons from the electron transport chain during the light-dependent reactions.

• NADPH is generated from ATP during the Calvin cycle.

• NADPH is produced by the oxidation of NADP+ in the stroma.

• NADPH is formed directly from water splitting without electron transport.

What is the significance of chlorophyll in photosynthesis?

• Chlorophyll is essential for capturing light energy for photosynthesis.

• Chlorophyll is a type of soil nutrient essential for plant growth.

• Chlorophyll helps in the respiration process of plants.

• Chlorophyll is responsible for water absorption in plants.

How does the absorption of light by chlorophyll affect Photosystem II?

• Chlorophyll absorbs light, which cools down Photosystem II.

• The absorption of light by chlorophyll prevents water splitting in Photosystem II.

• Chlorophyll's light absorption decreases electron energy in Photosystem II.

• The absorption of light by chlorophyll energizes electrons in Photosystem II, leading to water splitting and oxygen release.

What are the main products of the light dependent reactions?

• ATP, glucose, and oxygen

• Carbon dioxide, glucose, and water

• NADH, glucose, and carbon dioxide

• Oxygen, ATP, and NADPH

Explain the electron transport chain's role in ATP synthesis.

• The electron transport chain converts glucose into pyruvate for ATP synthesis.

• The electron transport chain generates a proton gradient that drives ATP synthesis via ATP synthase.

• The electron transport chain is responsible for the breakdown of fatty acids into acetyl-CoA.

• The electron transport chain directly produces ATP without a proton gradient.

How do the functions of Photosystem I and II differ?

• Photosystem II generates glucose and produces NADPH; Photosystem I splits water.

• Photosystem I splits water and generates ATP; Photosystem II produces NADPH.

• Photosystem II splits water and generates ATP; Photosystem I produces NADPH.

• Photosystem I and II both generate ATP and NADPH without splitting water.

What is the relationship between light intensity and the rate of ATP synthesis?

• Lower light intensity increases the rate of ATP synthesis.

• Higher light intensity increases the rate of ATP synthesis.

• Light intensity has no effect on ATP synthesis rates.

• Higher light intensity decreases the rate of ATP synthesis.