CO2 is utilized for the carboxylation of RuBP inside the bundle sheath cells of
1. Maize, Sorghum
2. Tomato, Bell pepper
3. Cacti, Sedum
4. Rice, wheat
Which of the following are special features of the C4 plants?
I: | They have a special type of leaf anatomy. |
II: | They tolerate higher temperatures and show a response to high light intensities. |
III: | They lack photorespiration and have greater productivity of biomass. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
Crops such as tomatoes and bell pepper, allowed to grow in a carbon dioxide rich environment, show higher yields because:
1. | They show an increased rate of photosynthesis at higher carbon dioxide concentrations. |
2. | They can respond to high carbon dioxide conditions even in low light conditions. |
3. | They show C4 pathway for carbon fixation at high carbon dioxide is the limiting factor in such plants. |
4. | Only carbon dioxide is the limiting factor in such plants. |
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 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.
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
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.