CAM Plants Keep Stomata Closed in Daytime, Thus Reducing Loss

question 40

Multiple Choice

CAM plants keep stomata closed in daytime, thus reducing loss of water. They can do this because they

• A) fix CO₂ into organic acids during the night.
• B) fix CO₂ into sugars in the bundle-sheath cells.
• C) fix CO₂ into pyruvate in the mesophyll cells.
• D) use the enzyme phosphofructokinase, which outcompetes rubisco for CO₂.
• E) use photosystem I and photosystem II at night.

---

Definitions:

Radial Artery

A major artery in the forearm that supplies blood to the hand and arm, palpable at the wrist.

Bradycardia

A slower than normal heart rate, typically defined as fewer than 60 beats per minute in adults.

Tachycardia

A condition characterized by an abnormally fast heart rate, often defined as exceeding 100 beats per minute in adults.

Heart Rate

The number of heartbeats per unit of time, typically expressed in beats per minute (bpm), indicating cardiovascular fitness and health.