Asked by Sanyam Gupta on Jun 22, 2024
Verified
Which statement is accurate about how C4 plants are able to survive hot, dry spells during the growing season?
A) When the stomata close during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration.
B) When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in carbon dioxide concentration experienced in the leaf. This allows the plant to avoid photorespiration.
C) When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to avoid photorespiration.
D) When the stomata close during heat stress, RuBP carboxylase is exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration.
E) When the stomata open during heat stress, RuBP carboxylase is not exposed to the increase in oxygen concentration experienced in the leaf. This allows the plant to undergo photorespiration.
RuBP Carboxylase
An enzyme that catalyzes the first major step of carbon fixation in the process of photosynthesis, converting ribulose bisphosphate (RuBP) and carbon dioxide into two molecules of 3-phosphoglycerate.
Photorespiration
A process in plant metabolism where the enzyme RuBisCO oxygenates RuBP, leading to a decrease in photosynthetic efficiency and carbon fixation.
Stomata
Small openings found on the underside of plant leaves that enable gas exchange and transpiration.
- Acquire knowledge of the core principles and variances amongst diverse photosynthesis methods such as C3, C4, and CAM.
- Gain insights into the processes that allow photosynthetic entities to optimize carbon dioxide intake while minimizing water depletion.
Verified Answer
JC
Jasmine ChunnJun 24, 2024
Final Answer :
A
Explanation :
When the stomata close during heat stress, it prevents the loss of water but also limits the exchange of gases, leading to a decrease in oxygen exposure for RuBP carboxylase. This helps the plant avoid photorespiration, which is less efficient than photosynthesis.
Learning Objectives
- Acquire knowledge of the core principles and variances amongst diverse photosynthesis methods such as C3, C4, and CAM.
- Gain insights into the processes that allow photosynthetic entities to optimize carbon dioxide intake while minimizing water depletion.