What Is the Main Adaptive Advantage of the C4 and CAM

question 37

Multiple Choice

What is the main adaptive advantage of the C4 and CAM photosynthesis strategies over the C3 strategy?

• A)They make it possible for the plant to use the Calvin cycle at night.
• B)They allow the plant to fix carbon more efficiently in dim or cool conditions.
• C)They help the plant conserve water and synthesize glucose efficiently under hot,dry conditions.
• D)They allow the plant to fix carbon more efficiently under conditions of low atmospheric CO2.

---

Definitions:

Tunica Media

Middle, usually muscular, coat of an artery or another tubular structure.

Capillary Beds

Networks of capillaries, the smallest blood vessels, that facilitate the exchange of water, oxygen, carbon dioxide, and many other nutrients and waste substances between blood and tissues.

Precapillary Sphincters

Circular muscular valves located at the entrance of capillary beds, controlling blood flow into those beds.

Thoroughfare Channels

In traditional Chinese medicine, energy pathways that allow Qi and blood to circulate throughout the body, connecting different organs and bodily functions.