मराठी
Tamil Nadu Board of Secondary EducationHSC Science Class 11

The Leaf

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Estimated time: 2 minutes
CBSE: Class 12

Key Points: The Leaf

  • Leaf: Lateral, green, flattened structure developing from the shoot apical meristem; the main organ for photosynthesis.
  • Parts of a leaf: Leaf base, petiole, and lamina; an axillary bud is present in the axil.
  • Types of leaves: Simple leaf (single blade, e.g., mango) and compound leaf (leaflets, e.g., neem, rose).
  • Venation: Arrangement of veins; reticulate (dicots) and parallel (monocots).
  • Phyllotaxy: Arrangement of leaves on the stem; alternate, opposite, and whorled.
  • Functions: Photosynthesis, transport of water/food, and gas exchange.
  • Modifications: Tendrils (climbing), spines (protection), pitcher (nutrition), hooks (support).
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