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प्रश्न
A rubber band stretches and reverts back to its original position. Bubble gum stretches, but it would not return to its original position. Is there any difference between the two processes? Discuss it with respect to plant growth (Hint: Elasticity (reversible) Plasticity (irreversible))
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उत्तर
A rubber band stretches and reverts back to its original position, it is due to elasticity. Bubble gum stretches, but it would not return to its original position, this is due to plasticity.
- The meristematic cells are rich in protoplasm and possess large conspicuous nuclei. Their cell walls are primary in nature, thin, cellulosic and elastic with abundant plasmodesmata connections.
- Plants follow different pathways in response to the environment or phases of life to form different kinds of structures. This ability is called plasticity, e. g., heterophylly in cotton, coriander and larkspur. In such plants, the leaves of the juvenile plant are different in shape from those in mature plants.
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Concept of Development
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संबंधित प्रश्न
Define the term development.
Which of the following statement/s is/are INCORRECT?
- Growth, differentiation and development are very closely related events in the life cycle of plants.
- The factors such as light, temperature, water and oxygen control the development of plants.
- The genetic and hormonal factors do not affect plant development if the external factors are favourable for growth.
- The last phase of development is senescence in which the ageing and death of plants occur.
- The development includes all phases of the life cycle except changes from the vegetative phase to the flowering phase in the plant.
Development in plants refers to all the changes from
