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NEET 2016 Phase 1 · BiologyAestivationPrevious Year Question

The standard petal of papilionaceous corolla is also called: (NEET 2016 (Phase I))

Answer: (C) Vexillum. In a papilionaceous (pea/bean) corolla the largest petal is the standard, which is also called the vexillum (hence the aestivation is termed vexillary).

  1. A.Carina
  2. B.Pappus
  3. C.Vexillum✓
  4. D.Corona

Correct Answer

(C) Vexillum

Solution & Explanation

In a papilionaceous (pea/bean) corolla the largest petal is the standard, which is also called the vexillum (hence the aestivation is termed vexillary). The two lateral petals are wings (alae) and the two fused anterior petals form the keel (carina). Pappus (modified calyx hairs of Asteraceae) and corona (an outgrowth of the corolla/perianth) are unrelated, so vexillum is correct. NCERT Reference: Ch 5, p.64, lines 9-12 — "the largest (standard) overlaps the two lateral petals (wings) which in turn overlap the two smallest anterior petals (keel); this type of aestivation is known as vexillary or papilionaceous."

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