Significance of C4 Pathway

Q. In $C_4$ plants, the bundle sheath cells:

1. Have thin walls to facilitate gaseous exchange
2. Have large intercellular spaces
3. Are rich in PEP carboxylase
4. Have a high density of chloroplasts

Q. Tropical plants like Sugarcane show high efficiency of carbon dioxide fixation because of

1. Calvin cycle
2. Hatch-Slack cycle
3. Cyclic- photophosphorylation
4. TCA cycle

Q. $C_4$ plants are more efficient in photosynthesis than $C_3$ 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

Q. Which of the following plants are low carbon dioxide compensation plants i.e. thrive well at even low carbon dioxide concentrations

1. C3- plants
2. C4- plants
3. C2- plants
4. Alpine plants