Question

which of the following types of carbon fixation is least common for plants in arid locations?
a c3
b c4
c cam
d none of the above

Explanation:

• C3 plants are less efficient in arid conditions as they are more prone to photorespiration when stomata are closed to conserve water.
• C4 plants have a mechanism to concentrate CO₂ around the Calvin cycle enzyme, reducing photorespiration.
• CAM plants open stomata at night to take in CO₂ and fix it, then use it during the day, which is efficient in arid environments.

Answer:

A. C3