Question

which term identifies a light - absorbing pigment?
photosystem
ferredoxin
thylakoid
chlorophyll

Explanation:

• Photosystem: It is a complex of proteins and pigments (but not the pigment itself) that functions in the light - dependent reactions of photosynthesis.
• Ferredoxin: It is an iron - sulfur protein that acts as an electron carrier in photosynthesis, not a pigment.
• Thylakoid: It is a membrane - bound compartment inside chloroplasts and cyanobacteria. It is the site of the light - dependent reactions of photosynthesis but not a pigment.
• Chlorophyll: It is a light - absorbing pigment that is crucial for photosynthesis. It absorbs light energy and converts it into chemical energy.

Answer:

chlorophyll