Practice important
Cold Stress Response
MCQ questions and answers.
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10
MCQ Questions
1. During cold stress, abscisic acid primarily helps a plant by promoting which response?
A.
Stomatal closure
B.
Fruit ripening
C.
Cell division in roots
D.
Pollen release
Correct Answer:
Stomatal closure
Explanation:
Abscisic acid promotes stomatal closure during cold stress, helping reduce water loss when low temperatures limit water uptake.
2. Why is stomatal closure useful to a plant experiencing cold stress?
A.
It reduces excessive water loss
B.
It increases flower color
C.
It speeds up seed germination
D.
It increases leaf size
Correct Answer:
It reduces excessive water loss
Explanation:
Cold conditions can reduce water absorption by roots, so ABA-induced stomatal closure helps conserve water.
3. Cold stress can increase the level of which plant hormone involved in stress protection?
A.
Abscisic acid
B.
Auxin
C.
Gibberellin
D.
Cytokinin
Correct Answer:
Abscisic acid
Explanation:
Cold stress commonly stimulates ABA accumulation, allowing the plant to activate protective stress responses.
4. Abscisic acid helps plants respond to cold stress by activating the expression of certain
A.
Stress-response genes
B.
Flower-color genes only
C.
Fruit-sweetness genes only
D.
Pollen-dispersal genes only
Correct Answer:
Stress-response genes
Explanation:
ABA acts as a signal that can activate genes producing proteins and substances involved in protection against cold.
5. Which cellular feature is helped by ABA-mediated responses during cold stress?
A.
Stability of cell membranes
B.
Breakdown of all cell walls
C.
Loss of chloroplasts
D.
Complete stoppage of respiration
Correct Answer:
Stability of cell membranes
Explanation:
ABA-related cold responses help maintain cell membrane stability, reducing cellular damage caused by low temperature.
6. During cold stress, ABA signaling may help plants produce protective
A.
Cold-responsive proteins
B.
Digestive enzymes
C.
Animal antibodies
D.
Floral pigments only
Correct Answer:
Cold-responsive proteins
Explanation:
Cold-responsive proteins help protect plant cells, and ABA can contribute to their production during cold stress.
7. What is the main role of ABA as a signal during cold stress?
A.
To coordinate protective responses
B.
To start rapid fruit growth
C.
To prevent all gene activity
D.
To cause immediate leaf expansion
Correct Answer:
To coordinate protective responses
Explanation:
ABA acts as a chemical signal that coordinates responses such as stomatal closure and activation of cold-protection genes.
8. A plant exposed to low temperature shows increased ABA production. This increase is most likely part of its
A.
Stress adaptation
B.
Normal flower opening
C.
Fruit ripening process
D.
Pollen germination process
Correct Answer:
Stress adaptation
Explanation:
Increased ABA production during cold exposure is a stress-adaptation response that helps the plant tolerate unfavorable temperature conditions.
9. Which response can ABA help regulate when cold conditions reduce water movement through a plant?
A.
Closing of stomata
B.
Opening of all stomata
C.
Rapid leaf enlargement
D.
Immediate seed germination
Correct Answer:
Closing of stomata
Explanation:
ABA promotes stomatal closure, which limits water loss when cold conditions interfere with water absorption and transport.
10. The protective effect of ABA during cold stress is mainly associated with helping plant cells
A.
Avoid or reduce cold-induced damage
B.
Produce more flowers immediately
C.
Stop using water permanently
D.
Become larger without division
Correct Answer:
Avoid or reduce cold-induced damage
Explanation:
ABA helps activate protective mechanisms that reduce cellular injury caused by low temperatures.
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Cold Stress Response
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