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Solution


Q.

In an area, the frog population decreased due to the spread of some diseases. Frogs are prey for snakes, but no major effect was seen in the population of snakes. Instead, there was a decline in the pesticide sale. What could be the possible reason
1 Frogs stopped eating grains due to their infection.  
2 There is no relation between the decrease in frog population and pesticide sales.  
3 Both frog and snake migrated to some other area  
4 Snakes now depended on other organisms that must be the pests for the crops grown.  

Ans.

(4)

Given scenario is an example of a food web. Infection in frogs could have possibly made snakes shift towards another prey such as rats. Rats destroy the stocked grains. When snakes started eating rats, the sale of pesticides against rats decreased.