In the C4 pathway, which of the following molecules combines with carbon dioxide?
1. glyceraldehyde phosphate
2. ribulose biphosphate
3. phosphoenol pyruvic acid
4. citric acid
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
C4 -plants are more efficient in photosynthesis than C3 -plants due to
1. higher leaf area
2. presence of larger number of chloroplasts in the leaf cells.
3. presence of thin cuticle
4. lower rate of photorespiration
THe C4 -plants are photosynthetically more efficient than C3 -plants because
(1) the CO2 compensation point is more
(2) CO2 generated during photorespiration is trapped and recycled through PEP carboxylase
(3) the CO2 efflux is not prevented
(4) they have more chloroplasts.
In 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
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.
Kranz anatomy is usually associated with
(1) C3 plants
(2) C4 plants
(3) CAM plants
(4) C3-C4 intermediate plants.
C4 plants have better productivity because
(1) C4 plants absorb more light
(2) C4 plants absorb more CO2
(3) C4 plants does not carry photorespiration
(4) C4 plants have more amount of RuBisCO.
What is the role of large bundle sheath cells found around the vascular bundles in C4 plants?
| 1. | To protect the vascular tissue from high light intensity. |
| 2. | To provide the site for photorespiratory pathway. |
| 3. | To increase the number of chloroplast for the operation of Calvin cycle. |
| 4. | To enable the plant to tolerate high temperature. |
Reason(R): They have a mechanism that increases the concentration of CO2 at the enzyme site.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
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