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Solution
The correct option is B (a). Midrib, (b) Lamina, (c) Veins, (d) Petiole, (e) Leaf base A leaf contains leaf base, a stalk like structure called petiole and lamina. The leaf lamina consists of a midrib (thick vein in the middle), veins and veinlets arranged in the form of a network. Thesfive major components are labelled in the figure below: