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Morphology of a leaf - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET

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  • 13 Questions around this concept.

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Whorled, simple leaves with reticulate venation are present in

Concepts Covered - 1

The Leaf and Its Parts

The Leaf and Its Parts

  • The leaf can be defined as a lateral, generally flattened structure borne on the stem.
  • It arises at the node. 
  • It bears the bud in its axil called axillary bud.
  • The axillary buds later develop into branches.
  • The leaves arise from shoot apical meristem and are arranged acropetally.
  • These are the important parts for the process of photosynthesis. 

Parts of the leaf:

A typical leaf consists of the following parts i.e. leaf base, petiole and lamina 

a) Leaf Base:

  • The leaf base connects the rest of the leaf to the stem.
  • It is also called the hypopodium.
  • Two small leaf-like structures called stipules may arise from the leaf base.
  • The leaves that bear stipules are called stipulate leaves while the leaves that do not bear stipules are called ex-stipulate leaves.
  • Stipules are mainly concerned with photosynthesis and protection of bud.
  • In monocot plants, the leaf base expands and covers the stem partially or wholly.
  • In some plants of the family leguminosae, the leaf base becomes swollen and is called pulvinus. It protects the young axillary bud.

b) Petiole:

  • It is also called the mesopodium.
  • It is a smooth or grooved, cylindrical or sub-cylindrical stalk which attaches the leaf to the leaf base.
  • It holds the leaf above the level of the stem.
  • Leaves with petioles are called petiolate leaves.
  • Leaves without petioles are called non-petiolate or sessile leaves.
  • Papaya has hollow petiole.

c) Lamina:

  • It is also called the leaf blade or the epipodium. 
  • It is the expanded green part of the leaf that bears veins.
  • The middle prominent vein is called the midrib.
  • The veins act as channels for the conduction of water and photosynthates.
  • The function of the lamina is to perform photosynthesis and transpiration.

 

 

TIP:

  • The leaves of dicot plants are called dorsiventral because of structural differences between dorsal and ventral surfaces.
  • The leaves of monocot are structurally identical in both surfaces, so these are called isobilateral leaves.
     

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The Leaf and Its Parts

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