1. Which plant hormone is commonly associated with the induction of flowering in some plants?
A.
Gibberellin
B.
Auxin
C.
Ethylene
D.
Abscisic acid
Correct Answer:
Gibberellin
Explanation:
Gibberellins can induce flowering in certain plants, especially some rosette and long-day plants.
2. Gibberellin promotes flowering in rosette plants mainly by causing:
A.
Root thickening
B.
Bolting
C.
Leaf fall
D.
Fruit ripening
Correct Answer:
Bolting
Explanation:
Gibberellin stimulates rapid elongation of the stem in rosette plants, a process called bolting, which may be followed by flowering.
3. In some long-day plants, gibberellin treatment can partly replace the requirement for:
A.
Long-day conditions
B.
High soil salinity
C.
Low oxygen conditions
D.
Complete darkness
Correct Answer:
Long-day conditions
Explanation:
In certain long-day plants, gibberellin can induce flowering even when the required long photoperiod is not provided.
4. Which of the following is an example of a flowering-related effect of gibberellin?
A.
Induction of flowering in some rosette plants
B.
Complete prevention of flowering in all plants
C.
Permanent closing of flowers
D.
Destruction of flower buds
Correct Answer:
Induction of flowering in some rosette plants
Explanation:
Gibberellin can promote the transition to flowering in certain rosette plants by stimulating stem elongation.
5. A rosette plant treated with gibberellin is most likely to show:
A.
Rapid elongation of the flowering stalk
B.
Complete stoppage of stem growth
C.
Immediate shedding of all leaves
D.
Permanent dormancy
Correct Answer:
Rapid elongation of the flowering stalk
Explanation:
Gibberellin induces bolting, or rapid elongation of the stem, which helps the plant produce a flowering stalk.
6. The use of gibberellin to induce flowering is especially useful in plants that require a specific:
A.
Photoperiod
B.
Leaf color
C.
Root shape
D.
Seed size
Correct Answer:
Photoperiod
Explanation:
Gibberellin may help induce flowering in some plants when the natural photoperiod requirement, such as long-day conditions, is not met.
7. Which plant form commonly responds to gibberellin by producing an elongated flowering stem?
A.
Rosette plant
B.
Aquatic alga
C.
Non-living seed coat
D.
Mature fruit
Correct Answer:
Rosette plant
Explanation:
Rosette plants have shortened stems, and gibberellin can stimulate stem elongation and flowering stalk formation in them.
8. Gibberellin-induced bolting is directly related to:
A.
Preparation for flowering
B.
Inhibition of seed germination
C.
Prevention of stem growth
D.
Suppression of flower formation in every plant
Correct Answer:
Preparation for flowering
Explanation:
Bolting produces an elongated stem that supports the development of flowers in several rosette plants.
9. Which statement about gibberellin and flowering is correct?
A.
Gibberellin induces flowering in every plant under all conditions.
B.
Gibberellin may induce flowering in some plants.
C.
Gibberellin always prevents flowering.
D.
Gibberellin has no effect on flowering-related growth.
Correct Answer:
Gibberellin may induce flowering in some plants.
Explanation:
The flowering response to gibberellin is plant-specific, but it can promote flowering in certain plants.
10. An agricultural application of gibberellin in flowering studies is to:
A.
Induce bolting and flowering in suitable plants
B.
Stop all flower development
C.
Prevent stem elongation before flowering
D.
Replace flowers with roots
Correct Answer:
Induce bolting and flowering in suitable plants
Explanation:
Gibberellin is applied to suitable plants to stimulate bolting and, in some cases, induce flowering.
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