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25. Upon absorption of a photon, a chlorophyll molecule get converted to its excited state when the energy of photon is (1) more than that of ground state of pigment […]

24. If an Arobidopsis plant, mutated in lycopene biosynthetic pathway is grown in sunny tropical climate in the presence of oxygen: (1) it would accumulate higher biomass due to higher […]

23. Which one of the following is NOT a characteristic property of carotenoids? (1)They possess complex porphyrin ring. (2)They are integral constituent of thylakoid membrane. (3) They are also called […]

  22. Which one of the following is the function of cytochrome b6f complex? (1) Oxidation of water to O2 (2) Oxidation of plasto-hydroquinone (PQH2) (3) Reduction of NADP+ to […]

21. In chloroplast, the site of coupled oxidation-reduction reactions is the (1) outer membrane              (2) inner membrane (3) thylakoid membrane    (4) stromal space The correct answer is (3) thylakoid […]

20. Which of the following mechanisms is NOT involved in providing photo protection to plants? (1) Degradation of 01 protein. (2) Zeaxanthin formation. (3) Photolysis of water. (4) Thermal dissipation […]

The photon intensity captured by green plants is used in the following processes: (i) Photosynthesis (ii) Generation of heat (iii) Production of toxic products such as superoxide, singlet oxygen etc. […]

18. Photosystem II functions as a light dependent water plastoquinone oxidoreductase. What are the names of two reaction center protein that bind electron transfer prosthetic group, such as P680, pheophytin […]

17. The quantum yield of oxygen evolution during photosynthesis drastically drops in far-red light. This effect is known as: (1) Far red drop.          (2) Red drop. (3) Blue drop.         […]

16. The donor and acceptor of electron for cytb/f6 are (1) PQ and UQ        (2) UQ and Cyt C (3) UQ and PC        (4) PQ and PC The correct answer […]