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Plant Growth and Development Video Lecture | Crash Course for NEET

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FAQs on Plant Growth and Development Video Lecture - Crash Course for NEET

1. What are the stages of plant growth and development?
Ans. The stages of plant growth and development include germination, seedling, vegetative, flowering, and fruiting stages. Germination is when the seed absorbs water and begins to sprout. The seedling stage involves the establishment of roots and leaves. The vegetative stage is characterized by rapid growth and leaf development. The flowering stage is when plants produce flowers, and the fruiting stage is when flowers develop into fruits containing seeds.
2. How do environmental factors affect plant growth?
Ans. Environmental factors such as light, temperature, water, and soil nutrients significantly affect plant growth. Adequate light is essential for photosynthesis, while temperature influences metabolic rates. Water availability affects cell turgor and nutrient transport. Soil nutrients provide the necessary elements for growth, and their deficiency can lead to stunted growth or poor development.
3. What role do hormones play in plant growth and development?
Ans. Plant hormones, or phytohormones, play crucial roles in regulating growth and development. Auxins promote cell elongation and root growth, gibberellins stimulate stem elongation and seed germination, cytokinins promote cell division and shoot growth, abscisic acid helps in stress responses and dormancy, and ethylene regulates fruit ripening and flower senescence.
4. How do plants respond to different light conditions?
Ans. Plants respond to light conditions through various mechanisms such as phototropism, which is the growth of plant organs towards light, and photoperiodism, which affects flowering based on day length. Plants may also adjust their leaf orientation and growth patterns to maximize light absorption, optimizing their photosynthetic efficiency.
5. What is the significance of seed dispersal in plant development?
Ans. Seed dispersal is vital for plant development as it reduces competition among seedlings and allows plants to colonize new areas. Various methods of dispersal, such as wind, water, and animal-mediated dispersal, help ensure that seeds reach suitable environments for germination. This process contributes to genetic diversity and the survival of plant species.
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