1. Which plant hormone is commonly used to break seed dormancy?
A.
Auxin
B.
Gibberellin
C.
Ethylene
D.
Abscisic acid
Correct Answer:
Gibberellin
Explanation:
Gibberellin promotes the breaking of seed dormancy and helps initiate seed germination.
2. Application of gibberellin to dormant seeds mainly promotes which process?
A.
Seed germination
B.
Leaf fall
C.
Fruit ripening
D.
Flower colour change
Correct Answer:
Seed germination
Explanation:
Gibberellin helps dormant seeds resume growth and begin germination.
3. Gibberellin breaks seed dormancy by helping the embryo obtain which type of material?
A.
Stored food
B.
Pollen grains
C.
Flower pigments
D.
Leaf wax
Correct Answer:
Stored food
Explanation:
Gibberellin promotes the breakdown of stored food reserves, supplying energy to the growing embryo.
4. In cereal seeds, gibberellin stimulates the production of which enzyme during germination?
A.
Pepsin
B.
Alpha-amylase
C.
Lipase inhibitor
D.
Chlorophyllase
Correct Answer:
Alpha-amylase
Explanation:
Gibberellin stimulates alpha-amylase production, which breaks down stored starch during seed germination.
5. The action of gibberellin on seed dormancy helps convert stored starch into which usable substance?
A.
Sugars
B.
Proteins only
C.
Mineral salts
D.
Cellulose fibres
Correct Answer:
Sugars
Explanation:
Alpha-amylase breaks starch into sugars that provide energy for the germinating embryo.
6. Which seed condition can often be reduced by treating seeds with gibberellin?
A.
Dormancy
B.
Ripeness
C.
Leaf senescence
D.
Fruit softening
Correct Answer:
Dormancy
Explanation:
Gibberellin treatment is used to reduce or overcome seed dormancy and encourage germination.
7. Gibberellin treatment is useful when seeds fail to germinate because they are in a state of what?
A.
Dormancy
B.
Photosynthesis
C.
Pollination
D.
Transpiration
Correct Answer:
Dormancy
Explanation:
Dormant seeds do not germinate under otherwise suitable conditions, and gibberellin can help overcome this state.
8. Which part of a cereal seed responds to gibberellin by producing enzymes that help break dormancy?
A.
Aleurone layer
B.
Seed coat only
C.
Root cap
D.
Leaf epidermis
Correct Answer:
Aleurone layer
Explanation:
In cereal seeds, gibberellin acts on the aleurone layer to stimulate enzyme production for mobilizing food reserves.
9. What is the immediate benefit of breaking seed dormancy with gibberellin?
A.
Earlier germination
B.
Permanent seed storage
C.
Prevention of water absorption
D.
Reduction of embryo growth
Correct Answer:
Earlier germination
Explanation:
By overcoming dormancy, gibberellin allows the seed embryo to resume growth and germinate earlier.
10. Which statement about gibberellin and dormant seeds is correct?
A.
It can stimulate dormant seeds to germinate.
B.
It prevents all seed germination.
C.
It destroys the seed embryo.
D.
It stops the breakdown of stored food.
Correct Answer:
It can stimulate dormant seeds to germinate.
Explanation:
Gibberellin promotes dormancy breaking by activating processes needed for seed germination.
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