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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 […]

15. Plants dissipate excess excitation light energy as heat so as to protect from photo-oxidative damage. The mechanism is known as (1) Photo chemical quenching (2) Non Photochemical quenching (3) […]

14. Thylakoid membrane has lateral asymmetrical positioning of photosystem in chloroplast. Which statement is correct for distribution of PS-I and PS-II? (1) PS-I in no appressed portion and PS-II in […]

Among the following which mineral plays an important role in photolysis of water? (1) Mg++ (2) Ca++ (3) Na+ (4) Mn++                 The mineral […]

12. Which mineral ion play important role in photolysis of water associated with photosystem II? (1) Manganese     (2) Magnesium (3) Iron                  (4) Molybdenum The mineral ion that plays an […]

11. Essential component of chloroplast photosynthetic apparatus for photosynthesis is coded by (1) Nuclear gene (2) Chloroplast gene (3) Nuclear and chloroplast gene (4) Chloroplast and mitochondrial genes The essential […]

10. Which ion gradient is formed across the thylakoid membrane, if a light is incident on isolated thylakoid? (1) H+                               (2) Na+ (3) Both Na+ and H+          (4) Cl– […]