Multiple Choice QuestionsC4 plants are more efficient in photosynthesis than C3 plants due to
higher leaf area
the presence of a larger number of chloroplasts
the presence of thin cuticle
the presence of thin cuticle
Read the following four statements, A, B,C and D select the right option having both correct statements.
A) Z scheme of light reaction takes place in presence of PS- I only.
B) Only PS-I is functional in cyclic photophosphorylation.
C) Cyclic photophosphorylation results into synthesis of ATP and NADPH2
D) Stroma lamellae lack PS-II as well as NADP.
B and D
A and B
B and C
B and C
Kranz anatomy is one of the characteristics of the leaves of
potato
wheat
sugarcane
sugarcane
Oxygenic photosynthesis occurs in
Chromatium
Oscillatoria
Rhodospirillum
Rhodospirillum
Which 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
D.
ATP, NADPH and O2
Cyclic-photophosphorylation involves only pigment system-I. When the photons activate PS-I, a pair of the electron are raised to a higher energy level. They are captured by the primary acceptor, which passes them on to ferredoxin, plastoquinone, cytochrome complex, plastocyanin and finally back to reaction centre of PS-I ie, P700. At each step of electron transfer, the electrons lose potential energy. Their trip downhill is caused by the transport chain to pump H+ across the thylakoid membrane. The proton gradient thus established is responsible for forming ATP ( 2 molecules). No reaction of NADP to NADPH + H+.
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
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