Q. No.Phosphoenol pyruvate (PEP) is the primary CO2 acceptor in
(1) C3 -plants
(2) C4 -plants
(3) C2 -plants
(4) C3 and C4 -plants
With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?
(1) Light saturation for CO2-fixation occurs at 10% of full sunlight.
(2) Increasing atmospheric CO2 concentration upto 0.05% can enhance the CO2-fixation rate
(3) C3 plants respond to higher temperature with enhanced photosynthesis, while C4 plants have a much lower temperature optimum.
(4) Tomato is a greenhouse crop, which can be grown in a CO2-enriched atmosphere for higher yield.
A plant in your garden avoids photorespiratory losses, has improved water use efficiency, shows high rates of photosynthesis at high temperatures and has improved efficiency of nitrogen utilization. In which of the following physiological groups would you assign this plant?
(1) C4
(2) CAM
(3) Nitrogen-fixer
(4) C3
In a chloroplast the highest number of protons are found in
1. lumen of thylakoids
2. inter membrane space
3. antenna complex
4. Stroma
In photosynthesis, the light-independent reactions take place at
1. thylakoid lumen
2. photosystem l
3. photosystem ll
4. stromal matrix
PGA as the first CO2 fixation was discovered in the photosynthesis of
(1) bryophyte
(2) gymnosperm
(3) angiosperm
(4) algae
Cyclic-photophosphorylation results in the formation of
1. NADPH
2. ATP and NADPH
3. ATP, NADPH and O2
4. ATP
The 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.
Production of NADPH in a chloroplast takes place during
1. cyclic photophosphorylation
2. non-cyclic photophosphorylation
3. series photophosphorylation
4. substrate level photophosphorylation.
Blackman's law is related to
(1) respiration
(2) transpiration
(3) root pressure
(4) photosynthesis.
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