Practice important
Bolting
MCQ questions and answers.
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MCQ Questions
1. What is bolting in plants?
A.
Rapid elongation of the stem before flowering
B.
Development of roots from leaves
C.
Dropping of leaves during winter
D.
Formation of fruits without flowers
Correct Answer:
Rapid elongation of the stem before flowering
Explanation:
Bolting is the rapid elongation of the stem, especially the internodes, that usually occurs before flowering in certain plants.
2. Which plant hormone commonly promotes bolting?
A.
Auxin
B.
Gibberellin
C.
Ethylene
D.
Abscisic acid
Correct Answer:
Gibberellin
Explanation:
Gibberellin promotes stem and internode elongation, which leads to bolting in suitable plants.
3. Bolting is most commonly observed in which type of plants?
A.
Rosette plants
B.
Aquatic algae
C.
Non-flowering mosses
D.
Plants with underground flowers
Correct Answer:
Rosette plants
Explanation:
Rosette plants have short stems and leaves arranged close to the ground; gibberellin-induced stem elongation in these plants is called bolting.
4. Which part of the stem elongates rapidly during bolting?
A.
Internodes
B.
Root hairs
C.
Leaf veins
D.
Flower petals
Correct Answer:
Internodes
Explanation:
Bolting mainly involves rapid elongation of the stem internodes, causing the flowering stem to rise above the leaves.
5. What is one important result of bolting?
A.
The plant produces a taller flowering stalk
B.
The plant loses all its roots
C.
The leaves become underground organs
D.
The seeds stop developing permanently
Correct Answer:
The plant produces a taller flowering stalk
Explanation:
During bolting, rapid stem elongation raises the flowering region and produces a tall flowering stalk.
6. Application of gibberellin to a rosette plant can cause:
A.
Bolting and early flowering
B.
Complete inhibition of stem growth
C.
Immediate root decay
D.
Permanent closing of flowers
Correct Answer:
Bolting and early flowering
Explanation:
Gibberellin treatment can stimulate stem elongation in rosette plants and may lead to bolting followed by flowering.
7. Which of the following is associated with bolting in cabbage-like plants?
A.
Elongation of the flowering stem
B.
Thickening of root hairs only
C.
Reduction in internode length
D.
Formation of flowers below the soil
Correct Answer:
Elongation of the flowering stem
Explanation:
In cabbage-like rosette plants, bolting is recognized by the elongation of the stem that bears the flowers.
8. Why is gibberellin useful in studying bolting?
A.
It can stimulate the elongation required for bolting
B.
It prevents all plant growth
C.
It destroys the flowering stem
D.
It changes flowers into roots
Correct Answer:
It can stimulate the elongation required for bolting
Explanation:
Gibberellin is useful because it promotes stem and internode elongation, a key feature of bolting.
9. Bolting generally occurs before which stage of plant development?
A.
Flowering
B.
Seed germination
C.
Seed dormancy
D.
Root hair formation
Correct Answer:
Flowering
Explanation:
Bolting is the rapid growth of the flowering stem that generally takes place before the plant flowers.
10. Which observation best indicates that a plant is undergoing bolting?
A.
A sudden increase in stem height due to internode growth
B.
A sudden loss of all chlorophyll
C.
Roots growing upward into the air
D.
Leaves changing into seeds
Correct Answer:
A sudden increase in stem height due to internode growth
Explanation:
Rapid increase in height caused by internode elongation is the characteristic visible sign of bolting.
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