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NEET 2022 · BiologyPrevious Year Question

Which one of the following plants shows vexillary aestivation and diadelphous stamens? (NEET 2022)

Answer: (B) Pisum sativum. Vexillary (papilionaceous) aestivation, where the large standard petal overlaps the two wings which overlap the two keel petals, together with diadelphous stamens, are diagnostic of the pea/bean group (Fabaceae – Papilionoideae).

  1. A.Colchicum autumnale
  2. B.Pisum sativum✓
  3. C.Allium cepa
  4. D.Solanum nigrum

Correct Answer

(B) Pisum sativum

Solution & Explanation

Vexillary (papilionaceous) aestivation, where the large standard petal overlaps the two wings which overlap the two keel petals, together with diadelphous stamens, are diagnostic of the pea/bean group (Fabaceae – Papilionoideae). Among the options only Pisum sativum (pea) shows both features; Colchicum and Allium (Liliaceae) and Solanum (Solanaceae) do not. NCERT Reference: Ch 5, p.64, lines 9-12 — "In pea and bean flowers, there are five petals, the largest (standard) overlaps the two lateral petals (wings)"

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