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Plant Hormones

Apical domina...

Question

Apical dominance phenomenon is caused by :

(a) auxins (b) GA

(c) cytokinins (d) ABA

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Solution

Apical dominance is thought to be caused by the apical bud producing IAA (auxin) in abundance. This auxin is transported basipetally from the apical bud. The auxin causes the lateral buds to remain dormant.
so option( a) is correct

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Similar questions

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.

Q. Pick out the correct statements.
(A) Cytokinins specially help in delaying senescence.
(B) Auxins are involved in regulating apical dominance.
(C) Ethylene is especially useful in enhancing seed germination.
(D) Gibberellins are responsible for immature falling of leaves.

Q. Match the entries in Column - I with those of Column - II and choose the correct answer:

	Column - I		Column - II
(A)	Cytokinins	(P)	Stress hormone
(B)	Auxins	(Q)	Ripening of fruits
(C)	Abscisic acid	(R)	Apical dominance
(D)	Ethylene	(S)	Bolting
		(T)	Richmond Lang effect

Q. Match the columns and choose the correct combination.

	I		II
(a)	Cytokinin	(p)	Stress hormone
(b)	Auxins	(q)	Ripening of fruits
(c)	Abscisic acid	(r)	Apical dominance
(d)	Ethylene	(s)	Bolting
		(t)	Richmond-Lang Effect

Question 02:

Coconut water contains
(a) ABA
(b) auxin
(c) cytokinin
(d) gibberellin

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