Select the pair that consists of plant growth promoters only.

Auxins and cytokinins

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Gibberellins and ABA

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Ethylene and ABA

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All of these

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Solution

The correct option is A Auxins and cytokinins
Auxins and cytokinins are plant growth promoters, the roles played by auxin and cytokinin are as follows.
Auxins: Cell enlargement and longitudinal growth of root and shoot.
Reactivation of cambium in the growth season, that is, responsible for secondary growth, promotes apical dominance and parthenocarpy, inhibits abcission.
Cytokinins: induces morphogenesis that is differentiation of cells into tissues and organs.delays senescence, breaks dormancy and promotes seed germination, enhances expression of a sexual characteristic- femaleness in some plants.
Auxin/cytokinin ratio influences root and shoot formation and growth
So, the correct answer is 'Auxins and cytokinins'

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Similar questions

Q. Select the pair that consists of plant growth promoter only.

Question 30.01:

Auxins are growth hormones capable of promoting cell elongation. They have been used in horticulture to promote growth, flowering and rooting. Write a line to explain the meaning of the following terms related to auxins.
Auxins precursors

Anti-auxins

Synthetic auxins

Q. Assertion: Phytohormones are the plant compounds that can promote and inhibit the plant growth.
Reason: There are some phytohormones like auxin, cytokinins which play a role in plant growth and some phytohormones like abscisic acid which inhibit the plant growth.

Q. Functions of plant growth promoters and plant growth inhibitors are given here in a jumbled up manner. Select the option that correctly segregates these functions.

I. Cell division

II. Cell enlargement

III. Pattern formation

IV. Tropic growth

V. Flowering

VI. Fruiting

VII. Seed germination

VIII. Response to wound

IX. Response to stresses of biotic and abiotic origin

X. Dormancy

Q. Pick up the correct statements.
(A) Cytokinins promote cell division.
(B) Auxins promote growth.
(C) Abscisic acid promotes growth.
(D) Gibberellins inhibit growth.

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