Electrons from excited chlorophyll molecule of photosystem-II are accepted first by
1. cytochrome-b
2. cytochrome-f
3. quinone
4. ferredoxin
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the leaves of C4 -plants malic acid synthesis during CO2 fixation occurs in
(1) epidermal cells
(2) mesophyll cells
(3) bundle sheath
(4) guard cells
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe wavelength of light abosorbed by Pr form of phytochrome is :
(1) 640 nm
(2) 680 nm
(3) 720 nm
(4) 620 nm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn photosystem-I, the first electron acceptor is :
(1) ferredoxin
(2) cytochrome
(3) plastocyanin
(4) an iron-sulphur protein
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyDuring photorespiration, the oxygen consuming reaction(s) occur in :
(1) stroma of chloroplasts and mitochondria
(2) stroma of chloroplasts and peroxisomes
(3) grana of chloroplasts and peroxisomes
(4) stroma of chloroplasts
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPhotorespiration is favoured by
(1) high O2 and low CO2 concentration
(2) low O2 and high CO2 concentration
(3) low light intensity
(4) low temperature.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe C4 plants grow very efficiently in warm climates because they
(1) consume fewer ATP molecules for glucose synthesis
(2) minimize photorespiratory losses
(3) have more efficient chloroplasts
(3) contain enzymes which are not inactivated at high temperatures.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyFollowing is needed in the ionic form during non-cyclic photophosphorylation but not during cyclic photophosphorylations in higher plants.
(1) copper
(2) iron
(3) manganese
(4) zinc
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyProduction of NADPH in a chloroplast takes place during
1. cyclic photophosphorylation
2. non-cyclic photophosphorylation
3. series photophosphorylation
4. substrate level photophosphorylation.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe photoautotrophic organisms that do not split water to obtain reducing power are
(1) purple bacteria
(2) cyanobacteria
(3) green plants
(4) none of these
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology