Multiple Choice QuestionsC4 plants have better productivity because
C4 plants absorb more light
C4 plants absorb more CO2
C4 plants does not carry photorespiration
C4 plants have more amount of RuBisCO
Assertion: Photorespiration interferes with the successful functioning of Calvin cycle.
Reason: Photorespiration oxidises ribulose1,5 biphosphate which is an acceptor of CO2 in Calvin cycle.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Photorespiration shows formation of
sugar but not ATP
ATP but not sugar
both ATP and sugar
neither ATP nor sugar
Which of the following is correctly labelled for the given figure
A: PS II; B : PS I; C :e- acceptor, D: LHC
A: LHC; B:e- acceptor; C: PS I; D: PS II
A: PS I; B:PS II; C:e- acceptor; D: LHC
A: e- acceptor; B : LHC; C: PS Il; D: PS I
Kranz anatomy is usually associated with
C3 plants
C4 plants
CAM plants
C3-C4intermediate plants.
Assertion : The efficiency of C4 plant is more than those of C3 plant.
Reason : C4 plants are more efficient in picking CO2.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are hue but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
The first stable product of Calvin cycle is
3- phosphoglycerate
1, 3 biphosphoglycerate
glyceralydehyde - 3 phosphate
ribulose - 5 - phosphate
Assertion : Due to pollution atmospheric concentration of CO2 is increasing which will be harmful for C4 plants whereas productivity is going to increase for C3 plants.
Reason : C4 plants have greater efficiency for CO2 as CO2 is fixed by PEP oxygenase.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
C.
If assertion is true but reason is false.
CO2 concentration of the atmosphere is 0.036% or 360 ppm. It is a limiting factor for C3 plants as the available CO2 concentration is lower than the optimum concentration for photsynthesis. Increase upto 0.05% increases the rate of photosynthesis in most C3 plants. When the concentration is reduced, there comes a point at which illuminated plant parts stop absorbing carbon dioxide from their environment. It is known as CO2 compensation point or threshold value. The value of CO2 is 25 - 100 ppm in C3 plants and 0 - 10 ppm in C4 plants. The main reason for low compensation value for C4 plants is the greater efficiency of CO2 fixation through PEP- carboxylase.
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