Light and Temperature in Flower Initiation — NEET

Which of the following statements regarding the role of extrinsic factors in plant development are correct? S1: Environmental factors such as light and gravity can influence the direction and patterns of plant growth. S2: Extrinsic factors like temperature and light are known to control various developmental processes by modulating Plant Growth Regulators (PGRs). S3: The phenomenon of plasticity, exemplified by heterophylly in cotton, indicates that plants follow different pathways in response to environment. S4: Vernalisation, flowering, dormancy, and seed germination are some key developmental events that can be controlled by extrinsic factors. S5: Development in plants is considered the sum of growth and differentiation, primarily controlled by intrinsic genetic factors only. S6: The final structure at maturity of a cell or tissue in plants is solely determined by its genetic makeup, irrespective of its position.