Question

in what way are the light - dependent and light - independent reactions of photosynthesis similar?
both require chemical energy to proceed.
both occur in the chloroplast.
both produce oxygen as a byproduct.
both involve carbon fixation.

Explanation:

• Light - dependent reactions occur in the thylakoid membranes of the chloroplast. They use light energy to produce ATP and NADPH.
• Light - independent reactions (Calvin cycle) occur in the stroma of the chloroplast. They use the ATP and NADPH from the light - dependent reactions to fix carbon dioxide and produce glucose.
• So, both the light - dependent and light - independent reactions of photosynthesis occur in the chloroplast.
• The light - dependent reactions produce oxygen as a by - product, while the light - independent reactions do not.
• Carbon fixation occurs only in the light - independent reactions.
• The light - dependent reactions use light energy, not chemical energy (the light - independent reactions use the chemical energy from ATP and NADPH produced in the light - dependent reactions).

Answer:

Both occur in the chloroplast.