In photosystem I, the primary electron acceptor is probably a Fe-S protein. The reduced primary acceptor transfers the electrons to the secondary electron acceptor P430. The reduced P430 passes its electrons to ferredoxin (Fd) present at the outer surface of the thylakoid membrane. Related Theory In light reaction of photosynthesis two types of photosystems are involved. PS-I consists of plenty of chlorophyll- a and very less quantity of chlorophyll-b. These pigments absorb light energy and transfer it to the reaction centre - P700 After absorbing adequate amount of light energy electron gets excited from P700 molecule and moves to iron-sulphur protein complex, designated as A (Fe-S). It gets reduced after accepting electrons. It later gives this electron to ferredoxin and gets oxidized again. 
In photosystem-I, the first electron acceptor is:
NEET UG 2006 — Botany Photosynthesis in Higher Plants
In photosystem-I, the first electron acceptor is:
Held on 30 Apr 2006 · Verified 9 Jul 2026.
Options
- A
an iron-sulphur protein
- B
ferredoxin
- C
cytochrome
- D
plastocyanin
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Match List I with List II: $\begin{array}{|l|l|l|l|}\hline & \text{List - I} & & \text{List - II} \\\hline \text{A}. & \text{Chlorophyll a} & \text{(i)} & \text{Yellow-green} \\\hline \text{B.} & \text{Chlorophyll b} & \text{(ii)} & \text{Yellow} \\\hline \text{C.} & \text{Xanthophylls} & \text{(iii)} & \text{Blue-green} \\\hline \text{D.} & \text{Carotenoids} & \text{(iv)} & \text{Yellow to Yellow-orange} \\\hline\end{array}$ Choose the option with all correct matches.
Which of the following statements about RuBisCO is true?
Observe the given figure. Identify the different stages labelled with alphabets by selecting the correct option. 
How many molecules of ATP and NADPH are required for every molecule of $\mathrm{CO}_2$ fixed in the Calvin cycle?
Given below are two statements: Statement I: In $\mathrm{C}_3$ plants, some $\mathrm{O}_2$ binds to RuBisCO, hence $\mathrm{CO}_2$ fixation is decreased. Statement II: In $\mathrm{C}_4$ plants, mesophyll cells show very little photorespiration while bundle sheath cells do not show photorespiration. In the light of the above statements, choose the correct answer from the options given below:
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