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Plant Growth Regulators

One hormone h...

Question

One hormone hastens maturity period in juvenile conifers, second hormone controls xylem differentiation, while the third hormone increases the tolerance of plants to various stresses. They are respectively

A

Gibberellin, Auxin, Ethylene

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B

Auxin, Gibberellin, Cytokinin

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C

Gibberellin, Auxin, ABA

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D

Auxin, Gibberellin, ABA.

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Solution

The correct option is C Gibberellin, Auxin, ABA
Spraying juvenile conifers with gibberellins hastens their maturity period, thus leading to early seed production. Auxins control xylem differentiation, help in cell elongation and also maintains apical dominance. Abscisic acid (ABA) increases the tolerance of plants to various kinds of stresses, therefore, is also known as the stress hormone.

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Similar questions

Q. Assertion :Abscisic acid (ABA) is also called stress hormone. Reason: ABA increases the tolerance of plants to various kinds of stresses.

Q. Very short answer type.
Name the hormone that makes plants more tolerant to various stresses.

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. Assertion: Juvenile hormone inhibits maturation of insects if given artificially in later stages of growth in insects. Reason :It forms giant larvae.

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