Why is stem important ? List its normal and modified functions.
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Science, technology, engineering and mathematics workers play a key role in the sustained growth and stability of the U.S. economy, and are a critical component to helping the U.S. win the future. STEM education creates critical thinkers, increases science literacy, and enables the next generation of innovators....
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- The stem is the ascending part of the axis bearing branches, leaves, flowers and fruits. It develops from the plumule of the embryo of a germinating seed. It bears nodes and internodes.
Functions of the Stem :
- Spreading out branches bearing leaves, flowers and fruits.
- Conducting water, minerals and photosynthates.
Modification of Stems :
- Storage of Food: Underground stems of potato, ginger, turmeric, zaminkand, colocasia are modified to store food in them. They also act as organs of perennation to tide over conditions unfavourable for growth.
- Modifications for support: Stem tendrils which develop from axillary buds, are slender and spirally coiled and help plants to climb such as in gourds (cucumber, pumpkins, watermelon) and grapevines.
- Stem modifications for defence: Axillary buds of stems may also get modified into woody, straight and pointed thorns. Thorns are found in many plants such as Citrus, Bougainvillea. They protect plants from browsing animals.
- Modification of stems for photosynthesis: Some plants of arid regions modify their stems into flattened (Opuntia), or fleshy cylindrical (Euphorbia) structures. They contain chlorophyll and carry out photosynthesis. Besides these, stems can also be modified for vegetative propagation.
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