BioInteractive Light Reactions of Photosynthesis

Question 1

Where do the light reactions of photosynthesis take place?

Accepted Answer

Thylakoid membranes

Answer

The light reactions occur on the thylakoid membranes inside the chloroplast.

Question 2

Which molecule captures light energy during the light reactions?

Accepted Answer

Chlorophyll

Answer

Chlorophyll absorbs light energy and initiates the light-dependent reactions.

Question 3

What are the two main products of the light reactions used in the Calvin cycle?

Accepted Answer

ATP and NADPH

Answer

The light reactions produce ATP and NADPH, which power the Calvin cycle.

Question 4

What is the source of electrons that replace those lost by Photosystem II?

Accepted Answer

Water

Answer

Water molecules are split (photolysis) to donate electrons to Photosystem II.

Question 5

What is the oxygen released during photosynthesis derived from?

Accepted Answer

Water

Answer

Oxygen is released when water is split during the light reactions at Photosystem II.

BioInteractive - Photosynthesis BioInteractive Test Practice Test