Which of the following statements is not correct?
- PGR is of only one kind of intrinsic control
- Only under genomic control, these PGRs play an important role in plant growth and development
- Many of the extrinsic factors such as temperature and light control plant growth and development via PGR
- Vernalization, Flowering, dormancy, seed germination and plant movements are under the control of extrinsic factors along with intrinsic factors