Topic: Plant growth regulators: auxin, gibberellin, cytokinin, ethylene, ABA· Plant Physiology

You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

1. Auxin and cytokinin

2. Auxin and abscisic acid

3. Gibberellin and abscisic acid

4. IAA and gibberellin

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 1. Auxin and cytokinin

In tissue culture, the ratio of auxin to cytokinin controls differentiation. A balanced supply gives both roots and shoots; high auxin favours roots, high cytokinin favours shoots.

Abscisic acid is an inhibitor, and gibberellin mainly promotes stem elongation, so the other pairs are not suitable.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots?

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