Question

Which one of the following statement regarding auxin is/are correct?

• A. IAA and IBA are natural but $NAA,2,4–Dand2,4,5–T$are synthetic auxins
• B. IAA and NAA are natural but IBA, 2, 4, 5–T and 2, 4–D are synthetic auxins
• C. NAA and 2, 4, 5–T are natural but IAA, IBA and 2, 4–D are synthetic auxins
• D. IAA, NAA, IBA, 2, 4–D and 2, 4, 5–T are synthetic auxins

Answer 1

The correct option is A IAA and IBA are natural but $NAA,2,4–Dand2,4,5–T$are synthetic auxins

The term ‘auxin’ is applied to the indole-3-acetic acid (IAA), and to other natural and synthetic compounds having certain growth regulating properties. All natural and synthetic auxins have been used extensively in agricultural and horticultural practices

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

NAA (naphthalene acetic acid), 2, 4-D (2, 4-dichlorophenoxyacetic acid) and 2, 4, 5-T (2, 3, 5-trichlorophenoxyacetic acid) are synthetic auxins.