Biology – The Plant Leaf – Notes For W.B.C.S. Examination.

জীববিজ্ঞান – উদ্ভিদের পাতা – WBCS পরীক্ষার নোট ।

• Leaves, usually, are thin and flattened organs, borne above ground.Continue Reading Biology – The Plant Leaf – Notes For W.B.C.S. Examination.
• There are varieties of leaves in terms of shapes, sizes, and textures. Likewise, different species of plants have different shapes, sizes, and textures of leaves.
• Some varieties of leaves are thick and juicy (especially of succulent plants).
• Leaves are usually of green color because of the presence of chloroplast.
• However, some show plants have colorful leaves (see image given below) −
• Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines .

Functions of Leaves

• Following are the major functions of leaves −
  • Leaves prepare food through photosynthesis.
  • Leaves are the most important parts through which plants respire.
  • Some leaves also store foods for the contingency period.
  • Leaves assist in reproduction and pollination.
  • Some leaves (especially of succulents plants – shown above), store chemical energy and water.

Modified Leaves

• To survive in an adverse environment, some of the plant species (especially leaves) modified themselves. Following are the list of such leaves −
• Spine leaves − Such leaves are look like spines, e.g. cactus plants (see image below).
• Bract leaves − Also known as pseudanthia (or false flowers), they are colorful leaves (see image below).
• Succulent leaves − These leaves store water and organic acids (see image below).
• Tendril leaves − Such leaves take the form of tendril and support plant to climb, e.g. pea plants (see image below).
• Scaly leaves − Some leaves modify themselves to protect buds known as scaly leaves, e.g. onion, garlic, etc. (see image below).
• Hook leaves − Such leaves modified as nails known as hook leaves, e.g. Bignonia (see image below).
• Pitcher leaves − Such leaves trap insects, e.g. pitcher plant. This is known as carnivorous plant.

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