NEET Biology question

Which one of the following chemical classes of PGRs is **not** correctly matched?

(A)Adenine derivative – Kinetin
(B)Carotenoid derivative – Abscisic acid (ABA)
(C)Terpenes – Indole-3-acetic acid (IAA)Correct
(D)Indole compounds – Indole-3-butyric acid (IBA)

Answer: (C)

Solution

Per NCERT Class 11 (Section 15.4, *Plant Growth Regulators — Characteristics*), **indole-3-acetic acid (IAA)** is an **indole compound**, whereas **gibberellins (GA3)** are **terpenes**. Therefore pair (c) is incorrectly matched. IAA (indole-3-acetic acid) is an

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Question ID VK-114108