1. What is the main effect of gibberellin on a rosette plant?
A.
It causes stem elongation
B.
It causes leaf fall
C.
It stops root growth
D.
It prevents seed formation
Correct Answer:
It causes stem elongation
Explanation:
Gibberellin promotes the elongation of the short stem of a rosette plant.
2. The rapid elongation of the stem in a rosette plant after gibberellin treatment is called what?
A.
Germination
B.
Bolting
C.
Dormancy
D.
Abscission
Correct Answer:
Bolting
Explanation:
Bolting is the rapid upward elongation of the stem in rosette plants, and gibberellin can induce it.
3. Before gibberellin treatment, a rosette plant usually has what type of stem?
A.
Very short stem
B.
Hollow underground stem
C.
Long climbing stem
D.
Thick woody stem
Correct Answer:
Very short stem
Explanation:
Rosette plants characteristically have very short stems, with leaves arranged close to the ground.
4. Gibberellin treatment changes the growth habit of a rosette plant mainly by making its stem what?
A.
Longer
B.
Harder
C.
Darker
D.
Wider underground
Correct Answer:
Longer
Explanation:
Gibberellin stimulates stem elongation, changing the compact rosette form into a taller form.
5. Which plant growth response is commonly associated with gibberellin in rosette plants?
A.
Bolting and flowering
B.
Leaf shrinking and drying
C.
Root curling and breaking
D.
Stem shortening and thickening
Correct Answer:
Bolting and flowering
Explanation:
In many rosette plants, gibberellin promotes bolting and may help the plant reach the flowering stage.
6. A rosette plant treated with gibberellin is most likely to show which visible change?
A.
Elongation of the central stem
B.
Complete loss of its leaves
C.
Formation of underground flowers
D.
Permanent stoppage of growth
Correct Answer:
Elongation of the central stem
Explanation:
The most visible effect of gibberellin on a rosette plant is the elongation of its central stem.
7. Why is gibberellin useful in studying rosette plant growth?
A.
It can induce bolting
B.
It can remove all plant hormones
C.
It can stop photosynthesis
D.
It can prevent stem development
Correct Answer:
It can induce bolting
Explanation:
Gibberellin is useful because it induces bolting, making the short stem of a rosette plant elongate.
8. In a rosette plant, gibberellin primarily acts on which part to produce bolting?
A.
The stem
B.
The seed coat
C.
The root cap
D.
The fruit wall
Correct Answer:
The stem
Explanation:
Bolting results mainly from gibberellin-induced elongation of the stem.
9. What happens to the compact appearance of a rosette plant after gibberellin treatment?
A.
It becomes taller and less compact
B.
It becomes shorter and more compact
C.
It becomes completely leafless
D.
It changes into a root structure
Correct Answer:
It becomes taller and less compact
Explanation:
Stem elongation caused by gibberellin makes the plant taller and reduces its compact rosette appearance.
10. Gibberellin-induced bolting in a rosette plant may help the plant proceed toward which stage?
A.
Flowering
B.
Root decay
C.
Leaf shedding
D.
Seed dormancy
Correct Answer:
Flowering
Explanation:
After bolting, the elongated stem can support the development of flowers in many rosette plants.
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