Question

 The first electron acceptor from an excited chlorophyll molecule of photosystem 2, it is-

A. Quinone

B. Cytochrome

C. Iron-sulfur protein

D. Ferredoxin

Answer 1

Hint: PSII is activated in the non-cyclic pathway of photophosphorylation. In photophosphorylation, energy is trapped in the form of $NADPH_2$ and ATP using sunlight. Here solar energy is converted into chemical energy.

Complete answer:

1. Process of photophosphorylation takes place in the thylakoid membrane of the chloroplast. Two types of photosystems are found at the membrane of the thylakoid.

2. During photophosphorylation two types of pathways are used. One is cyclic and the second is non-cyclic.

3. The chlorophyll molecules found in photosystems become excited due to the absorption of sunlight and the release of electrons.

4. These electrons are received by electron carriers and then passed to the electron transport system (ETS). This ETS is found at the membrane of the thylakoid. Electrons move according to the reduction potential. During this process, energy is trapped in the form of ATP and $NADPH_2$ molecules.

5. In non-cyclic pathways both PSI and PSII are used. First of all, PSII is activated by the absorption of light. Chlorophyll A acts as a reaction center in it. This absorbs the light of 680 nm. Electrons are released and given to the first acceptor of PSII, which is plastoquinone. In the presence of sunlight, water splits and donates its electrons to the chlorophyll molecule.

6. PQ after receiving electrons from chlorophyll a gives electrons to PSI via ETS. Here ATP is made.

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