alleryWhich plant hormone was the first to be discovered and is produced at the tip of stems and roots?
ACytokinin
BAuxin
CGibberellin
DEthylene
Answer & Solution
Correct answer: B. Auxin
1. Auxins were the first plant hormones discovered.
2. The term auxin (Gk. auxein, to grow) was introduced by Kogl and Haagen-Smith in 1931.
3. Auxins are produced at the tip of stems and roots and migrate to the zone of elongation.
4. Hence the answer is auxin.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 16 Plant and Animal Hormones "Auxins", p.237_
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