PGR and Intrinsic Plant Growth Control — NEET Biology
📚 Practice ConceptRemember, the role of PGR is of only one kind of intrinsic control. Along with genomic control and extrinsic factors, they play an important role in plant growth and development. The PGRs are diverse in nature as temperature and light, control plant growth and development via PGR. Some of such events could be: vernalisation, flowering, dormancy, seed germination, plant movements, etc.
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.
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