alleryAuxin is produced primarily at
Athe shoot apex, and transported downward
Bthe leaves only, in sunlight hours
Cthe root cap, and transported upward
Dthe bark of mature trees, after wounding
Answer & Solution
Correct answer: A. the shoot apex, and transported downward
Auxin (IAA) is synthesised at the shoot apical meristem and travels downward in a polar fashion.
It promotes cell elongation, apical dominance, root initiation in cuttings, and parthenocarpy.
The root cap secretes other signals
leaves contribute but are not the primary source.
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