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Desiccation Tolerance
MCQ questions and answers.
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MCQ Questions
1. What does desiccation tolerance allow a plant cell to withstand?
A.
Loss of a large amount of water
B.
Permanent flooding
C.
High salt absorption only
D.
Continuous darkness
Correct Answer:
Loss of a large amount of water
Explanation:
Desiccation tolerance is the ability of plant cells or tissues to survive severe water loss and recover when water becomes available again.
2. Which plant hormone is closely associated with the development of desiccation tolerance?
A.
Auxin
B.
Abscisic acid
C.
Gibberellin
D.
Ethylene
Correct Answer:
Abscisic acid
Explanation:
Abscisic acid helps plants respond to dehydration and promotes protective changes that improve tolerance to water loss.
3. During dehydration, abscisic acid helps plant cells mainly by inducing the production of which substances?
A.
Protective proteins
B.
Digestive enzymes
C.
Flower pigments
D.
Cellulose-degrading enzymes
Correct Answer:
Protective proteins
Explanation:
Abscisic acid can activate genes that produce protective proteins, which help stabilize cellular structures during dehydration.
4. Why are protective proteins useful during desiccation?
A.
They help protect cell membranes and proteins
B.
They increase leaf expansion
C.
They promote rapid fruit ripening
D.
They break down all stored food
Correct Answer:
They help protect cell membranes and proteins
Explanation:
Protective proteins reduce damage to important cell components when water content becomes very low.
5. A plant showing desiccation tolerance can usually do what after rehydration?
A.
Recover normal cellular activity
B.
Remain permanently dead
C.
Lose all genetic material
D.
Stop using water permanently
Correct Answer:
Recover normal cellular activity
Explanation:
A key feature of desiccation tolerance is the ability to resume cellular functions after water is supplied again.
6. Which change helps a plant reduce water loss during dehydration?
A.
Closing stomata
B.
Opening stomata widely
C.
Increasing leaf surface area
D.
Increasing water evaporation
Correct Answer:
Closing stomata
Explanation:
Abscisic acid promotes stomatal closure, which reduces water loss from leaves during dry conditions.
7. What is the main danger to cells during severe desiccation?
A.
Damage caused by loss of water
B.
Excessive cell division
C.
Overproduction of chlorophyll
D.
Excessive absorption of water
Correct Answer:
Damage caused by loss of water
Explanation:
Severe dehydration can damage membranes, proteins, and other cellular structures, so protective responses are necessary for desiccation tolerance.
8. Which response is most directly related to improving desiccation tolerance?
A.
Accumulation of protective molecules
B.
Rapid production of flowers
C.
Increased stem elongation
D.
Increased leaf expansion
Correct Answer:
Accumulation of protective molecules
Explanation:
Protective molecules can help stabilize cells and reduce damage during severe water loss.
9. In a dehydrated plant, abscisic acid primarily acts as a signal for which condition?
A.
Water deficit
B.
Excess oxygen
C.
High light only
D.
Nutrient abundance
Correct Answer:
Water deficit
Explanation:
Abscisic acid levels increase in response to water deficit and activate mechanisms that help the plant tolerate dehydration.
10. Which statement best describes desiccation-tolerant tissues?
A.
They survive drying and recover after rehydration
B.
They cannot lose any water
C.
They require continuous flooding
D.
They permanently stop all metabolism
Correct Answer:
They survive drying and recover after rehydration
Explanation:
Desiccation-tolerant tissues are able to endure substantial drying and restore their functions when water is restored.
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Desiccation Tolerance
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