Which of the following statements is not correct?

  1. PGR is of only one kind of intrinsic control
  2. Only under genomic control, these PGRs play an important role in plant growth and development
  3. Many of the extrinsic factors such as temperature and light control plant growth and development via PGR
  4. Vernalization, Flowering, dormancy, seed germination and plant movements are under the control of extrinsic factors along with intrinsic factors
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