Leaf Structure and Components — NEET Biology
📚 Practice ConceptA typical leaf consists of three main parts: leaf base, petiole and lamina. The leaf is attached to the stem by the leaf base and may bear two lateral small leaf like structures called stipules. In monocotyledons, the leaf base expands into a sheath covering the stem partially or wholly. In some leguminous plants the leafbase may become swollen, which is called the pulvinus. The petiole help hold the blade to light. Long thin flexible petioles allow leaf blades to flutter in wind, thereby cooling the leaf and bringing fresh air to leaf surface. The lamina or the leaf blade is the green expanded part of the leaf with veins and veinlets. There is, usually, a middle prominent vein, which is known as the midrib. Veins provide rigidity to the leaf blade and act as channels of transport for water, minerals and food materials. The shape, margin, apex, surface and extent of incision of lamina varies in different leaves.
Consider the following statements: 1. The petiole helps to hold the leaf blade to light and in some plants allows fluttering, which helps in cooling and air circulation. 2. The lamina or leaf blade is the expanded green part of the leaf with veins and veinlets. 3. The midrib is the central vein of the lamina that provides rigidity and also acts as a channel for transport. 4. Veins and veinlets in leaves function only for transport of food and water, but not for providing rigidity. 5. The shape, margin, apex, and extent of incision of the lamina vary in different leaves. Which of the above statements are correct?
View solution & NCERT explanation
Correct answer: C — 1, 2, 3 and 5
Statement 1: Correct — Petiole positions leaf blade to light; fluttering cools leaf and allows aeration. Statement 2: Correct — Lamina/leaf blade is expanded green part with veins. Statement 3: Correct — Midrib gives rigidity and acts as transport channel. Statement 4: Incorrect — Veins provide rigidity as well as transport. Statement 5: Correct — Lamina varies in shape, margin, apex, incision. Thus, the correct set is 1, 2, 3, 5.
What does NCERT say about typical leaf consists three?
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