Multiple Choice QuestionsWhich one of the following acids is a derivative of carotenoids?
Indole butyric acid
Indole -3-acetic acid
Gibberellic acid
Gibberellic acid
Cyclic-photophosphorylation results in the formation of
NADPH
ATP and NADPH
ATP, NADPH and O2
ATP, NADPH and O2
The C-4 plants are photosynthetically more efficient than C-3 plants because
the CO2 compensation point is more
CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
the CO2 efflux is not prevented
the CO2 efflux is not prevented
The slow rate of decomposition of fallen logs in nature is due to their
low moisture content
poor nitrogen content
anaerobic environment around them
anaerobic environment around them
Which one of the following is resistant to enzyme action?
Cork
Wood fibre
Pollen exine
Pollen exine
C.
Pollen exine
The pollen wall consists of two layers the outer exine and inner intine. The exine chiefly made up of sporopollenin, which is derived by the oxidative polymerization of carotenoids. Sporopollenin is one of the most resistant biological materials known. The exine is thin in beginning but becomes very thick with maturity.
During secondary growth in the extrastelar region, cork cambium or phellogen cells divide periclinal, cutting off cells towards the outside and inside. The cells cutoff towards outside become suberised and dead and form cork. Cork is impervious to water due to suberin and provides protection to the underlying tissue.
In the leaves of C4 plants, malic acid formation during CO2 fixation occurs in the cells of
mesophyll
bundle sheath
phloem
phloem
The first acceptor of electrons from an excited chlorophyll molecule of photosystem II is
cytochrome
iron-sulphur protein
ferredoxin
ferredoxin
A plant requires magnesium for
holding cells together
protein synthesis
chlorophyll synthesis
chlorophyll synthesis
In photosystem-I, the first electron acceptor is
Ferredoxin
Cytochrome
Plastocyanin
Plastocyanin
During photorespiration, the oxygen-consuming reaction(s) occur in
stroma of chloroplasts and mitochondria
stroma of chloroplasts and peroxisomes
grana of chloroplasts and peroxisomes
grana of chloroplasts and peroxisomes
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