Question

question 24
which of the following is not true of the light - dependent reactions of photosynthesis?
a they generate nadph.
b atp is generated by a chemiosmotic mechanism.
c the photons cause magnesium to release electrons.
d they occur in thylakoid membranes.
e they generate glucose from co₂ and h₂o.

Explanation:

• Option A: In light - dependent reactions, \(NADP^{+}\) is reduced to \(NADPH\). So this is a true statement.
• Option B: ATP is generated by chemiosmosis (proton - motive force driving ATP synthase) in the light - dependent reactions. So this is a true statement.
• Option C: In photosynthesis, photons cause chlorophyll (magnesium is a part of the chlorophyll molecule) to release electrons. So this is a true statement.
• Option D: The light - dependent reactions occur in the thylakoid membranes (where the photosystems and electron transport chains are located). So this is a true statement.
• Option E: The generation of glucose from \(CO_{2}\) and \(H_{2}O\) occurs in the light - independent reactions (Calvin cycle), not in the light - dependent reactions.

Answer:

E. They generate glucose from \(CO_{2}\) and \(H_{2}O\).