If there are 250 snails in a pond, and within a year their number increases to 2500 by reproduction. What…

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?
  1. $25$
  2. $15$
  3. $10$
  4. $9$

Solution

Birth rate $=\frac{\Delta \mathrm{N}}{\mathrm{N} \Delta \mathrm{t}}$ Here, $\quad N=250$ $\Delta t=1$ year $\Delta N=2500-250$ $=2250$ Birth rate $=\frac{2250}{250 \times 1}$ $=9$

Asked in: NEET 2023 (Manipur)

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