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    NEET 2026 Preparation Tips for Chemistry, Biology and Physics

    Light-Harvesting Complex MCQ - Practice Questions with Answers

    Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

    Quick Facts

    • 12 Questions around this concept.

    Solve by difficulty

    In which of the following wavelength, photosystem I is inactive ?

    Photosystem usually involved in both cyclic and non-cyclic photophosphorylation is

    PS- I comprised of 

    1. p - 680, chlorophyll a - 695, p -700, chlorophyll - b and carotenoids
    2. Chlorophyll a - 670, chlorophyll a - 690, chlorophyll b and phycobilin

    The light-dependent reactions of photosynthesis take place in the __________.

    Choose the incorrect statement regarding the photosystem II.

    Directions: In the following questions, a statement of Assertion (A) is followed by a statement of reason (R).

    Assertion: The transport of electrons from excited PS -  I to the first electron acceptor is an uphill process.

    Reason: Electron goes downhill while transferring from first e-acceptor to cytochrome.

    Mark the correct choice as:

    Energy required for ATP synthesis in PS II comes from
     

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    At the light compensation point, the ratio of the rate of uptake of CO2 in photosynthesis and release of CO2 during respiration is equal to

    In photosynthesis, oxygen is produced by
     

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    Which of the following is/are the product(s) of cyclic photophosphorylation?

    (a) Both NADPH and H+ 

    (b) NADPH 

    (c) ATP 

    (d) Both ATP and NADPH

    Concepts Covered - 1

    Light-Harvesting Complex and Photosystems
    • The smallest group of pigment molecules which take part in the conversion of light energy to chemical energy is called the photosystem.
    • It has a reaction centre that is fed by 200 harvesting pigment molecules.
    • The harvesting molecules form a protein-based complex called the light-harvesting complex.
    • In the light-harvesting complex, there are two types of molecules: Antenna molecules and core molecules.
    • Antenna molecules absorb light of various wavelengths but shorter than that of the reaction centre.
    • On absorption of the photons, the antenna molecules get excited and electrons are pushed in the outer orbitals.
    • The excited antenna molecules hand over their energy to core molecules by resonance and come to the ground state. 
    • The energy picked up by the core molecules is supplied to the reaction centre.
    • On absorption of energy, the photo centre gets excited and extrudes an electron after which it comes to the ground state to repeat the cycle.
    • The frequency of excitation of the reaction centre is very high. It cannot be met by its direct absorption and it cannot absorb a shorter wavelength. 
    • Therefore, the reaction centre needs the help of harvesting molecules in the absorption of light energy.

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    Books

    Reference Books

    Light-Harvesting Complex and Photosystems

    Elementary Biology Vol 1

    Page No. : U4-96

    Line : 22

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