Question

multiple choice question
between photosystem ii and photosystem i is
the antenna complex,
an electron transport system,
the calvin cycle,
an enzyme that makes nadph
diagram (left) shows thylakoid membrane, photon, antenna complex, water-splitting enzyme, h⁺, stroma, nadp⁺, nadph, proton gradient, thylakoid space, and labels: photosystem ii, electron transport system, photosystem i, electron transport system

Explanation:

To solve this, we analyze the light - dependent reactions of photosynthesis. Photosystem II (PSII) absorbs light, splits water, and passes electrons. Between PSII and Photosystem I (PSI), the electrons move through an electron transport system (ETS). The antenna complex is part of PSII/PSI, the Calvin Cycle is light - independent, and the enzyme making NADPH is in the ETS after PSI. So the component between PSII and PSI is an electron transport system.

Answer:

B. an electron transport system