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(D) Many new plants are usually propagated by stem cutting. If we dip the lower cut end of a cutting in a dilute solution of auxins (especially $IBA$)

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Indole butyric acid

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(D) Many new plants are usually propagated by stem cutting. If we dip the lower cut end of a cutting in a dilute solution of auxins (especially $IBA$),a large number of roots are developed on the cut ends very soon,due to which these cuttings develop into successful plants. Among the auxins,$IBA$ (Indole$-3-$butyric acid) is widely used in horticulture for inducing root formation in stem cuttings.

The substances which have proved very effective to induce rooting from the cut end of the stem are:

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