The CAM pathway ____.
A) involves only the Calvin-Benson cycle
B) involves only the C₄ cycle
C) is used by plants in humid regions
D) is also known as photorespiration
E) needs day and night for completion

Question

The CAM pathway ____.
A) ​involves only the Calvin-Benson cycle
B) ​involves only the C₄ cycle
C) ​is used by plants in humid regions
D) ​is also known as photorespiration
E) needs day and night for completion​

Quizplus · Accepted Answer

The CAM pathway (Crassulacean Acid Metabolism) involves taking in carbon dioxide at night and storing it as an intermediate molecule before using it in the Calvin-Benson cycle during the day. Therefore, it requires both day and night for completion. CAM is used by plants in dry, arid regions to conserve water, such as cacti and succulents. It is distinct from the C₄ cycle which is used by some plants to increase their efficiency of photosynthesis in high light and temperature conditions. Photorespiration is a process where oxygen is taken in rather than carbon dioxide, leading to a loss of energy in plants.

The CAM Pathway ____