OBJECTIVE LIFE SCIENCE
ECOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Pesticides have a greater effect on larger animals than on insects.
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Top predators often accumulate the pesticides contained in the bodies of their prey.
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Birds and predatory mammals are not affected by pesticides.
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Pesticides kill insects and other target pests before they can absorb the poison.
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Detailed explanation-1: -Because the animals tend to eat lots of organisms from the level below in food chains, the concentration of pesticide in the bodies of organisms increases at higher levels of food chains.
Detailed explanation-2: -Impact on environment Pesticides can contaminate soil, water, turf, and other vegetation. In addition to killing insects or weeds, pesticides can be toxic to a host of other organisms including birds, fish, beneficial insects, and non-target plants.
Detailed explanation-3: -Pesticides used for crop protection when washed away go down into the soil. These pesticides absorbed by plants which are the producers. On consumption of these plants, the pesticides enter our food chain and being non-biodegradable, these chemicals get accumulated progressively and enter our body.
Detailed explanation-4: -Beyond direct toxicity, pesticides can significantly reduce, change the behavior of, or destroy populations of plants and animals. These effects can ripple up and down food chains, causing what is known as a trophic cascade. A trophic cascade is one easily-understood example of ecosystem-mediated pesticide effects.