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What are the sources and types of auxins used in agricultural practices?

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Auxins are exclusively synthetic chemicals used to simulate plant growth.

Natural auxins like IAA and IBA, as well as synthetic auxins like NAA and 2, 4-D, are used in agriculture.

Auxins are naturally only found in animal products and not used in agriculture.

All auxins, including IAA and IBA, are derived from microbial sources.

answer is B.

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Detailed Solution

Auxins like IAA and indole butyric acid (IBA) have been isolated from plants.

NAA (naphthalene acetic acid) and 2, 4-D (2, 4-dichlorophenoxyacetic) are synthetic auxins.

All these auxins have been used extensively in agricultural and horticultural practices.

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