Phytohormone A causes apical dominance while phytohormone B overcomes the same. Select the option that correctly identifies A and B.

A-Auxin, B-Cytokinin

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A-Cytokinin, A-Auxin

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A-Gibberellin, B-Cytokinin

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A-Auxin, B-Gibberellin

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Solution

The correct option is A A-Auxin, B-Cytokinin
Presence of cytokinin in an area causes preferential movement of nutrients towards it. When applied to lateral buds, they help in their growth despite the presence of apical bud. They thus act antagonistically to auxin which promotes apical dominance. Therefore, cytokinin can overcome apical dominance, caused by auxins.

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Similar questions

Identify the pair that is correctly matched from the given.

Auxin – cell division
Gibberellin – internodal elongation
Cytokinin – fruit ripening
Ethylene – apical dominance

Apical dominance phenomenon is caused by :

(a) auxins (b) GA

Q. The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as :
(a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin

Q. Match the names of the phytohormones with the roles listed.

	List I		List II
A	Auxin	p	Internodal elongation
B	Gibberellin	q	Cell division
C	Cytokinin	r	Ripening of fruits
D	Ethylene	s	Abscission
		t	Apical dominance

Q. Which statements are correct?

a

- Cytokinins suppress the synthesis of chlorophyll

b

- Auxins control apical dominance

c

- Gibberellins promote shoot elongation

d

- Abscisic acid enables seeds to with-stand desication.

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