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Question
Write a short note on rhizome.
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Solution
- Rhizome is a modification of underground stem for storage of food.
- It is prostrate, dorsiventrally thickened and brownish in colour.
- It grows either horizontally or obliquely beneath the soil.
- Rhizome shows nodes and internodes. It bears terminal and axillary buds at nodes.
- Terminal bud under favourable conditions produces aerial shoot which degenerates at the end of favourable condition.
- Growth of rhizome takes place with lateral buds, such growth is known as sympodial growth. e.g. Ginger (Zingiber officinale), Turmeric (Curcuma domestica), Canna etc.
- In plants where rhizomes grow obliquely, terminal bud brings about growth of rhizomes. This is known as monopodial growth. e.g. Nymphea, Nelumbo (Lotus), Pteris (Fern) etc.
- Rhizomes perform functions like storage of food, vegetative propagation and perennation.
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