NEET 2016 Phase 2 · BiologyPlacentationPrevious Year Question
Free-central placentation is found in (NEET 2016 (Phase II))
Answer: (A) Dianthus. In free-central placentation the ovules are borne on a central axis and septa are absent; NCERT names Dianthus and Primrose as examples.
- A.Dianthus✓
- B.Argemone
- C.Brassica
- D.Citrus
Correct Answer
(A) Dianthus
Solution & Explanation
In free-central placentation the ovules are borne on a central axis and septa are absent; NCERT names Dianthus and Primrose as examples. Argemone shows parietal placentation, Citrus shows axile, and Brassica (mustard) shows parietal — so only Dianthus exhibits free-central placentation. NCERT Reference: Ch 5, p.65, lines 35-37 — "When the ovules are borne on central axis and septa are absent, as in Dianthus and Primrose the placentation is called free central."
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