1. Which plant hormone mainly inhibits seed germination?
A.
Auxin
B.
Gibberellin
C.
Abscisic acid
D.
Cytokinin
Correct Answer:
Abscisic acid
Explanation:
Abscisic acid inhibits seed germination and helps maintain the dormant state of seeds.
2. A high level of abscisic acid in a seed generally causes:
A.
Rapid germination
B.
Seed dormancy
C.
Immediate flowering
D.
Fruit ripening
Correct Answer:
Seed dormancy
Explanation:
High abscisic acid levels prevent the seed from germinating and promote dormancy.
3. What is the effect of abscisic acid on the start of seed germination?
A.
It promotes the start of germination
B.
It delays or inhibits the start of germination
C.
It changes the seed into a fruit
D.
It increases leaf production
Correct Answer:
It delays or inhibits the start of germination
Explanation:
Abscisic acid acts as a germination inhibitor, so it delays the beginning of seed growth.
4. Seeds with increased abscisic acid are most likely to remain:
A.
Dormant
B.
Flowering
C.
Ripened
D.
Pollinated
Correct Answer:
Dormant
Explanation:
Abscisic acid maintains seed dormancy by preventing germination under unsuitable conditions.
5. Which change would most directly favor seed germination by reducing inhibition?
A.
An increase in abscisic acid
B.
A decrease in abscisic acid
C.
Continued seed dormancy
D.
Further suppression of seed growth
Correct Answer:
A decrease in abscisic acid
Explanation:
Lower abscisic acid activity reduces its inhibitory effect and allows the seed to begin germination.
6. Why does abscisic acid help prevent premature germination of seeds?
A.
It maintains seed dormancy
B.
It produces flowers on the seed
C.
It increases fruit size
D.
It causes leaf fall only
Correct Answer:
It maintains seed dormancy
Explanation:
By maintaining dormancy, abscisic acid prevents seeds from germinating before conditions are suitable.
7. Which seed is most likely to germinate slowly?
A.
A seed with high abscisic acid
B.
A seed with no dormancy
C.
A seed with reduced inhibition
D.
A seed with low abscisic acid
Correct Answer:
A seed with high abscisic acid
Explanation:
High abscisic acid inhibits germination, so such a seed is likely to germinate slowly or remain dormant.
8. Abscisic acid prevents seed germination mainly by promoting:
A.
Dormancy
B.
Pollination
C.
Fruit formation
D.
Leaf expansion
Correct Answer:
Dormancy
Explanation:
Promotion of dormancy is the main way abscisic acid prevents a seed from germinating.
9. If the inhibitory effect of abscisic acid is removed from a viable seed, the seed can more easily:
A.
Begin germination
B.
Stop all growth permanently
C.
Produce pollen immediately
D.
Become a mature fruit
Correct Answer:
Begin germination
Explanation:
Removing abscisic acid inhibition allows the seed to leave dormancy and begin germination.
10. Which statement about abscisic acid and seed germination is correct?
A.
It encourages every dormant seed to germinate
B.
It inhibits germination and maintains dormancy
C.
It has no effect on seeds
D.
It changes seeds directly into flowers
Correct Answer:
It inhibits germination and maintains dormancy
Explanation:
Abscisic acid is a key hormone that suppresses seed germination and keeps seeds dormant.
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