Which of the following statements are true for auxin? (i) IAA is the principal auxin in plants. ...

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Which of the following statements are true for auxin?
(i) IAA is the principal auxin in plants.
(ii) Auxin shows polar transport.
(iii) TIBA blocks polar transport of auxin.
(iv) IBA is both natural and synthetic auxin.
(A) (ii) and (iii)
(B) (i), (iii) and (iv)
(C) (i) and (iii)
(D) (i), (ii), (iii) and (iv)
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