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Plant Hormones

The role of g...

Question

The role of gibberellin is:

A

Inhibits lateral buds

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B

Stimulates fruit ripening

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C

Maintains seed dormancy

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D

Stimualtes rapid stem elongation

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E

All of the above

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Solution

The correct option is D Stimualtes rapid stem elongation
The gibberellins are plant growth hormones that enhance the longitudinal growth of the stem when applied to the intact plant. Gibberellins produce extraordinary elongation of stems and leaf sheaths in intact plants. The elongation of the stem is caused due to cell division and cell elongation induced by gibberellic acid. Thus option D is the correct answer.

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Q. Read the given statements and identify the plant hormones X, Y and Z.
(i) Hormone Y suppresses flowering in mango and also promotes rapid internode/petiole elongation in deep water rice plants and hence helping leaves or upper part of shoot to remain above water.
(ii) Hormone X promotes root growth and root hair formation.
(ii) Hormone Z inhibits the seed germination, increases the tolerance of plant to various stresses, play important role in seed development maturation and dormancy.

Q. Study the following statements.
I. X hormone promotes cell elongation and helps in the increase in the length of the plant.
II. Y hormone induces flowering in mango and also promotes rapid internode/petiole elongation in deep plants and hence helping leaves or upper parts of shoot above water.
III. Z hormone inhibits the seed germination, increase the tolerance of plant to various stresses, play important role in seed development, maturation and dormancy.
Identify the correct names of hormones marked as X, Y and Z.

Q. Biosynthesis of gibberellin is inhibited by

Physiological effects of gibberellins are _______.

1. Removal of genetic dwarfism

2. Inhibition of seed germination

3. Promoting bolting and flowering

4. Formation of more male flowers in cucurbita

Physiological effects of gibberellins are _______.

1. Removal of genetic dwarfism

2. Inhibition of seed germination

3. Promoting bolting and flowering

4. Formation of more male flowers in cucurbita

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