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GATE 2020 BT – Question 42

Plant, Animal and Microbial Biotechnology · Plants: Totipotency, organogenesis, regeneration, growth regulators, tissue and cell suspension culture, secondary metabolites · 2 marks · Multiple choice

Plant tissue culture uses [P] BAP, [Q] zeatin, [R] kinetin and [S] 2iP. Which are synthetic cytokinin analogues?

  1. P and Q only
  2. Q and S only
  3. R and S only
  4. P and R only

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Correct answer: (D) P and R only

Explanation

In the classification used for tissue-culture growth regulators, benzylaminopurine (BAP) and kinetin are synthetic cytokinin analogues. Zeatin and isopentenyladenine (2iP) are naturally occurring cytokinins. Thus P and R, D. This is the conventional classification intended by the historical paper.

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