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Gibberellin

The hormone t...

Question

The hormone that promotes rapid elongation of intermodes or leaf base in deep water rice plant is

A

Abscisic acid

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B

Ethylene

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C

Cytokinin

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D

Gibberellin

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Solution

The correct option is D Gibberellin
Gibberellin is a plant hormone which is involved in various developmental processes like stem elongation, germination, dormancy, leaf and fruit senescence, etc. It helps in process of bolting. Bolting is a rapid stem elongation of plant. It also promotes rapid elongation of the internodes of leaf base in such a way that dwarf plants overcome the genetic dwarfism.
Thus, the correct answer is option D.

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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. Which plant hormone stimulates internodal elongation in plants?

Q. Most of the plant hormones promote plant growth. A plant hormone which inhibits growth is :
(a) abscisic acid
(b) ethene
(c) ascorbic acid
(d) cytokinin

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