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NEET 2016 Phase 1 · BiologyPrevious Year Question

Which of the following is not a stem modification? (NEET 2016 (Phase I))

Answer: (A) Pitcher of Nepenthes. The pitcher of Nepenthes is a modified LEAF (the lamina forms the pitcher trap), not a stem.

  1. A.Pitcher of Nepenthes✓
  2. B.Thorns of citrus
  3. C.Tendrils of cucumber
  4. D.Flattened structures of Opuntia

Correct Answer

(A) Pitcher of Nepenthes

Solution & Explanation

The pitcher of Nepenthes is a modified LEAF (the lamina forms the pitcher trap), not a stem. In contrast, thorns of Citrus (axillary-bud/stem origin), tendrils of cucumber (axillary-bud stem tendrils) and the flattened green photosynthetic structures of Opuntia (phylloclades) are all stem modifications. Hence the pitcher of Nepenthes is the exception. NCERT Reference: NCERT (Class XI Morphology of Flowering Plants — Modifications of Stem/Leaf, pre-2023 rationalisation text) (Note: this specific content was rationalised out of the 2026-27 NCERT reprint; grounded in pre-2023 NCERT text.)

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