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Auxin

IAA and IBA a...

Question

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

A

natural

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B

semi-synthetic

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C

synthetic

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D

semi-natural

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Solution

The correct options are
A natural
C synthetic
There are two types of auxins: natural auxins and synthetic auxins. IAA and IBA are examples of natural auxins. NAA and 2,4-D are examples of synthetic auxins.

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(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.

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