Question

which statement describes thylakoids?
○ glucose is formed here.
○ water molecules are formed here.
○ only photosystem ii functions here.
○ photosystems i and ii function here.

Explanation:

To solve this, we recall the function of thylakoids in photosynthesis. Thylakoids are part of chloroplasts and are the site of the light - dependent reactions. Photosystems I and II are involved in the light - dependent reactions and are located in the thylakoid membranes.

• For the option "Glucose is formed here": Glucose is formed in the stroma during the Calvin cycle (light - independent reactions), not in thylakoids.
• For the option "Water molecules are formed here": Water is split in thylakoids (producing oxygen, electrons, and protons), but water molecules are not formed here.
• For the option "Only photosystem II functions here": Both photosystem I and II are present and function in thylakoids.
• For the option "Photosystems I and II function here": This is correct as both photosystems are involved in the light - dependent reactions that occur in thylakoid membranes.

Answer:

D. Photosystems I and II function here. (assuming the options are labeled A - D as is common, with A: Glucose is formed here, B: Water molecules are formed here, C: Only photosystem II functions here, D: Photosystems I and II function here)