NEET 2016 Phase 2 · BiologyFlowerPrevious Year Question
How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers? (NEET 2016 (Phase II))
Answer: (B) Four. Stamens of unequal length occur as didynamous (2 long + 2 short, Lamiaceae) and tetradynamous (4 long + 2 short, Brassicaceae).
- A.Three
- B.Four✓
- C.Five
- D.Six
Correct Answer
(B) Four
Solution & Explanation
Stamens of unequal length occur as didynamous (2 long + 2 short, Lamiaceae) and tetradynamous (4 long + 2 short, Brassicaceae). From the list: Salvia (didynamous) plus mustard, radish and turnip (all tetradynamous Brassicaceae) = four plants. The legumes (Indigofera, Sesbania, groundnut, gram) are diadelphous and the Liliaceae members (Allium, Aloe) have equal stamens, so the count is four. NCERT Reference: Ch 5, p.64, lines 35-36 — "There may be a variation in the length of filaments within a flower, as in Salvia and mustard."
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