NEET 2023 Phase 1 · BiologyPteridophytesPrevious Year Question
Identify the pair of heterosporous pteridophytes among the following:
Answer: (B) Selaginella and Salvinia. Answer: (B) Selaginella and Salvinia.
- A.Lycopodium and Selaginella
- B.Selaginella and Salvinia✓
- C.Psilotum and Salvinia
- D.Equisetum and Salvinia
Correct Answer
(B) Selaginella and Salvinia
Solution & Explanation
Answer: (B) Selaginella and Salvinia. Solution: Most pteridophytes are homosporous (all spores alike), but the genera Selaginella and Salvinia produce two kinds of spores — macro (mega) and micro spores — and are therefore heterosporous. Lycopodium, Psilotum and Equisetum are homosporous, so the only fully heterosporous pair is Selaginella and Salvinia. NCERT Reference: Class XI Biology, Plant Kingdom, p.32, lines 15-17 — "Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous.".
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