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Auxins

Which of the ...

Question

Which of the following is the natural auxin found mainly in plants?

A

GA₃

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B

IAA

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C

Zeatin

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D

IBA

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Solution

The correct option is B
IAA

Indole 3-Acetic acid (IAA) is the natural auxin mostly found in plants. GA₃is a gibberellic acid. Zeatin is a natural cytokinin. IBA is an auxin but not found naturally in abundance.

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Q. Match the following and choose the correct combination.

	List I		List II
A	Zeatin	1	Flowering hormone
B	Florigen	2	Synthetic auxin
C	IBA	3	Cytokinin
D	NAA	4	Natural auxin

Q. IAA and IBA are auxins while NAA and 2,4-D are auxins.

Q. Match the following column I with column II:

Column I	Column II
A. Ethephon	(i) GA
B. Terpene	(ii) Ethylene
C. Zeatin	(iii) Natural auxin
D. IAA	(iv) Cytokinin

Q. Read the given statements and select the correct option.
(i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass.
(ii) IAA is universal natural auxin, discovered by Kogl et al.
(iii) IBA is both natural and synthetic auxin.
(iv) Auxins promote the growth of lateral shoots.

Q. Artificial application of auxins like IAA, IBA, and NAA to unpollinated pistils can form

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