The arrangement of veins and the veinlets in the lamina of leaf is termed as venation. When the veinlets form a network, the venation is termed as reticulate. When the veins run parallel to each other within a lamina, the venation is termed as parallel. Leaves of dicotyledonous plants generally possess reticulate venation, while parallel venation is the characteristic of most monocotyledons.
Assertion (A): Leaf venation patterns help in plant identification and classification. Reason (R): In reticulate venation, the veins run parallel to each other within the lamina.
Correct answer: C — If assertion is true but reason is false.
The Assertion is true - venation patterns are indeed used for plant identification. However, NCERT explicitly states “When the veinlets form a network, the venation is termed as reticulate. When the veins run parallel to each other within a lamina, the venation is termed as parallel.” The Reason incorrectly describes reticulate venation as having parallel veins, when reticulate actually has a network pattern.
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