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  3. Biology
  4. Select the CORRECT statement from the following: (P) In monocots, leaf base expands into a sheath covering the stem partially or wholly (Q) In all leguminous plants, the leaf base may become swollen, which is called the pulvinus (R) The lamina or leaf blade is the green expanded part of the leaf with vein and veinlets (S) Veins provide rigidity to leaf blade

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Q. Select the CORRECT statement from the following:
(P) In monocots, leaf base expands into a sheath covering the stem partially or wholly
(Q) In all leguminous plants, the leaf base may become swollen, which is called the pulvinus
(R) The lamina or leaf blade is the green expanded part of the leaf with vein and veinlets
(S) Veins provide rigidity to leaf blade

NTA AbhyasNTA Abhyas 2020Morphology of Flowering Plants

Solution:

The leaf is divided into three parts - leaf base, petiole and lamina or leaf blade. Leaf base is a junction between the leaf and stem and in monocotyledons, it forms a sheath covering the stem completely or partially. In some leguminous plants, it swells up which is called a pulvinus. Petiole helps to hold the leaf blade allowing it to flutter in wind. The leaf blade is extended green part consisting of veins and veinlets which provide rigidity as well as transport food, water and minerals. In monocots, leaf base expands into a sheath covering the stem partially or wholly.