Concept: This question tests your knowledge of plant morphology, specifically modifications of plant parts for support, focusing on tendrils in Passiflora.

Why (C) is correct: In Passiflora (passion flower), the tendrils are specialized structures that help the weak-stemmed plant climb. These tendrils develop from the axillary buds, which are vegetative buds located in the axil of a leaf. They coil around supports, providing mechanical support to the plant.

Why other options are wrong:

A) Stipules are small, leaf-like appendages at the base of the petiole; they do not form tendrils in Passiflora.

B) Leaves can be modified into tendrils in some plants (e.g., sweet pea), but not in Passiflora.

D) Terminal leaflets are part of a compound leaf; while leaflets can form tendrils (e.g., pea), in Passiflora, it's the axillary bud that modifies.

NEET Tip: Remember that tendrils can arise from different plant parts (stem, leaf, leaflet, stipule, petiole, axillary bud) depending on the plant species. It's crucial to know specific examples.

Correct Answer: (C)