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Video: Stem Parts Functions, Modifications Video Lecture - NEET

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FAQs on Video: Stem Parts Functions, Modifications Video Lecture - NEET

1. What are the main parts of a stem and what are their functions?
Ans. The main parts of a stem are the nodes, internodes, buds, and vascular bundles. Nodes are the points where leaves and branches attach to the stem. Internodes are the segments of the stem between the nodes. Buds are undeveloped shoots that can grow into branches or flowers. Vascular bundles are specialized tissues that transport water, nutrients, and sugars throughout the stem.
2. How do modifications of stems occur and what are their purposes?
Ans. Modifications of stems occur through various processes such as thorns, tendrils, and underground storage stems. Thorns are modified stems that protect the plant from herbivores. Tendrils are modified stems that help plants climb or attach to structures for support. Underground storage stems, like rhizomes and tubers, store nutrients and water for the plant during unfavorable conditions.
3. What is the significance of stem modifications for plants?
Ans. Stem modifications play a crucial role in the survival and adaptation of plants. Thorns deter herbivores from feeding on the plant, protecting it from damage. Tendrils enable climbing plants to reach sunlight and maximize their growth potential. Underground storage stems store nutrients and water, allowing plants to survive during periods of drought or limited resources.
4. How do stems contribute to the overall growth and development of plants?
Ans. Stems are essential for the overall growth and development of plants. They provide structural support for leaves, flowers, and fruits, allowing them to be exposed to sunlight and maximize photosynthesis. Stems also transport water, nutrients, and sugars between the roots and leaves, ensuring the proper functioning of the plant's metabolic processes.
5. Can stem modifications occur naturally or are they only a result of human intervention?
Ans. Stem modifications can occur naturally as well as due to human intervention. Some stem modifications, such as thorns and tendrils, have evolved naturally over time as mechanisms for survival and reproduction. However, humans have also selectively bred and modified plants to develop specific stem characteristics, such as dwarf stems in ornamental plants or increased tuber size in agricultural crops.
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