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29. Which one of the following is the correct order of electron transport during light reaction in the thylakoid membrane of chloroplast? (1) P680–àCytochrome b6f —à PC–àPQ (2) P680–àPC–àCytochrome b6f–àPQ […]

28. In photosynthetic electron transport, electrons travel through carriers organized in the “Z-scheme”. The following are indicated as directions of electron flow: A. P680–àPQA–àPQB–àCytb6f–àPheo–àPC–àP700 B. P700–àA0–àA1–àFeSX–à FeSA–à FeSB–àFd C. P680–àPheo–àPQA–àPQB–àCytb6f–àPC–àP700 […]

In plants, the energy of sunlight is first absorbed by the pigments present in their leaf cells followed by the fixation of carbon through photosynthesis. Consider the following statements. (A) […]

26. After absorbing light, chlorophyll molecules in green plants exist in singlet and triplet states. Following are certain statement on singlet and triplet states of chlorophyll molecules: A. Singlet state […]

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 […]