NEET 2023 Phase 2 · BiologyPrevious Year Question
If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What should be their birth rate per snail per year? (NEET 2023 (Phase 2))
Answer: (D) 9. Answer: (D) 9.
- A.25
- B.15
- C.10
- D.9✓
Correct Answer
(D) 9
Solution & Explanation
Answer: (D) 9. Birth rate (per capita) = number of new individuals added / initial population. New individuals added = 2500 - 250 = 2250. Birth rate = 2250 / 250 = 9 offspring per snail per year. (Same per-capita method as NCERT's lotus example, 8/20 = 0.4 per lotus per year.) Verified: (2500-250)/250 = 9. Hence answer D. NCERT: Ch 11, p.191, lines 30-32 — "we calculate the birth rate as 8/20 = 0.4 offspring per lotus per year."
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