1. Which plant hormone can help break seed dormancy and promote seed germination?
A.
Cytokinin
B.
Ethylene
C.
Abscisic acid
D.
Auxin
Correct Answer:
Cytokinin
Explanation:
Cytokinins can help overcome seed dormancy, allowing dormant seeds to resume growth and germinate.
2. The application of cytokinin to a dormant seed is mainly intended to:
A.
Induce seed dormancy
B.
Break seed dormancy
C.
Prevent water absorption
D.
Stop embryo growth permanently
Correct Answer:
Break seed dormancy
Explanation:
Cytokinin treatment may break dormancy and enable the seed embryo to begin germination.
3. Which of the following is a cytokinin that may be used to overcome seed dormancy?
A.
Kinetin
B.
Abscisic acid
C.
Ethylene
D.
Indole-3-acetic acid
Correct Answer:
Kinetin
Explanation:
Kinetin is a cytokinin, and cytokinins can be used to help break seed dormancy.
4. Breaking seed dormancy by cytokinin treatment allows the seed to:
A.
Resume germination
B.
Become permanently inactive
C.
Lose its embryo
D.
Stop absorbing nutrients
Correct Answer:
Resume germination
Explanation:
When dormancy is broken, the dormant seed can restart the growth processes needed for germination.
5. Which plant growth regulator generally promotes dormancy rather than helping to break it?
A.
Cytokinin
B.
Abscisic acid
C.
Kinetin
D.
Zeatin
Correct Answer:
Abscisic acid
Explanation:
Abscisic acid is commonly associated with the maintenance of seed dormancy, whereas cytokinins can help overcome dormancy.
6. A farmer wants to stimulate germination in some dormant seeds. Which treatment may be useful?
A.
Applying a cytokinin
B.
Applying only abscisic acid
C.
Preventing the seeds from taking up water
D.
Keeping the seeds permanently inactive
Correct Answer:
Applying a cytokinin
Explanation:
Cytokinin application is a possible method for breaking seed dormancy and stimulating germination.
7. Which statement about cytokinins and dormant seeds is correct?
A.
Cytokinins can help dormant seeds begin germination.
B.
Cytokinins always prevent seed germination.
C.
Cytokinins destroy the seed coat in every seed.
D.
Cytokinins convert seeds into fruits.
Correct Answer:
Cytokinins can help dormant seeds begin germination.
Explanation:
One application of cytokinins is overcoming seed dormancy so that germination can start.
8. Zeatin belongs to which group of plant hormones that can help break seed dormancy?
A.
Cytokinins
B.
Abscisic acids
C.
Auxins
D.
Ethylene compounds
Correct Answer:
Cytokinins
Explanation:
Zeatin is a naturally occurring cytokinin, and cytokinins may promote the release of seeds from dormancy.
9. What is the immediate biological outcome expected when cytokinin successfully breaks seed dormancy?
A.
The seed starts germination
B.
The seed loses all stored food
C.
The embryo stops dividing
D.
The seed becomes more dormant
Correct Answer:
The seed starts germination
Explanation:
Breaking dormancy removes a barrier to growth, allowing the seed to initiate germination.
10. Cytokinins are useful in seed technology because they can:
A.
Overcome dormancy in certain seeds
B.
Maintain all seeds in a dormant state
C.
Prevent the formation of embryos
D.
Stop every seed from germinating
Correct Answer:
Overcome dormancy in certain seeds
Explanation:
A recognized application of cytokinins is helping certain dormant seeds overcome dormancy and germinate.
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