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Solution


Q.

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   [2023]
1 10  
2 9  
3 25  
4 15  

Ans.

(2)

Total number of snails in a pond (in the beginning) = 250

Total number of snails after a year = 2500

Number of snails added = 2500 - 250 = 2250

Birth rate = New snails added / Total number of snails in the beginning = 2250 / 250 = 9 individuals per snail per year