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Class 10 Class 12

DDT residues are rapidly passed through food chain causing biomagnification because DDT is

• liposoluble

• moderately toxic

• non-toxic to aquatic animals

• water soluble

A.

liposoluble

Many pesticides, such as DDT, aldrin and dieldrin are accumulated in the environment. They are fat soluble and generally non-biodegradable, They get incorporated into the food chain and ultimately deposited in the fatty tissue of animals and humans. In the food chain because of their build up, they get magnified in the higher trophic levels called biological magnification. The phenomenon of biological magnification is also reported of certain other pollutants such as heavy metals.eg, mercury, copper and radioactive substances as strontium-90

Many pesticides, such as DDT, aldrin and dieldrin are accumulated in the environment. They are fat soluble and generally non-biodegradable, They get incorporated into the food chain and ultimately deposited in the fatty tissue of animals and humans. In the food chain because of their build up, they get magnified in the higher trophic levels called biological magnification. The phenomenon of biological magnification is also reported of certain other pollutants such as heavy metals.eg, mercury, copper and radioactive substances as strontium-90

What trophic level is occupied by the birds in an ecosystem ?
• First
• Second
• Third
• Fourth

C.

Third

Cockroaches can feed both on plant and animal food, they are called :
• Herbivores
• Carnivores
• Omnivores
• None of the above

C.

Omnivores

The animals that feed on plants are called :
• Producers
• Carnivores
• Insectivores
• Herbivores

D.

Herbivores

What trophic level is occupied by the Phytoplankton in an ecosystem ?
• First
• Second
• Third
• Fourth

A.

First

The green plants in the ecosystem-terminology are called :
• Producers
• Consumers
• Herbivores
• Carnivores

A.

Producers

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