Tag: soil pollution
Questions Related to soil pollution
Which of these is made by using chemicals?
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Organic manure
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Biofertilizers
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Natural insecticides
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Pesticides
Organic manure is the substance made up of animal and human excreta and plants wastes. Biofertilizer is the fertilizer made up of living or dried microorganism. Natural insecticides are the substance used to kill the harmful insect. It is made up of plant products and microorganisms. They have no negative impact on the environment. While pesticide is the synthetic substance used to kill the harmful pest. It is made of a chemical in factories. It can involve in the food chain and cause harmful effects to the environment.
Primary consumers have more ................ than the secondary consumers.
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Bioaccumulation
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Calorific value
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Population density
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All of the above
The accumulation of chemicals in the living cells is known as bioaccumulation. When there is excessive use of the pesticides for the protection of fruits and vegetables against the harmful pests, this may lead to its accumulation in the food products. When these products are consumed, the chemicals deposit in the fatty tissues of the host. The concentration of the chemicals goes on reducing with the increase in the trophic level of the consumers. So, the primary consumers will have more bioaccumulation than the secondary consumers.
The increase in the copy of a gene which expresses itself to release enzyme which breaks the pesticides into less toxic chemicals is a
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Parasitic mechanism
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Protective mechanism
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Negative feedback mechanism
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All of the above
Which of the following determines the action of protective enzyme?
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Catalyses the removal of hydrogen atoms from a particular molecule
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Phosphorylation of hexose
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Breaks the pesticide into less toxic chemicals
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Both A and C
Pests developed with ............. contributes to pests resistance more quickly.
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Shorter generation times
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Longer generation times
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Shorter lifespan
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None of the above
The development of pesticide resistance indicates that
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The effect of pesticide has increased
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The effect of pesticides has decreased
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No effect on the action of pesticides
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Gradually increases but the effect of pesticides decreases later on
DDT is a
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Non-biodegradable pollutant
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Biodegradable pollutant
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Antibiotics
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None of the above
Non biodegradable pollutants are the pollutants that do not get easily degraded or broken down into harmless material. Common examples of such pollutants are DDT (Dichloro diphenyl trichloro ethane), BHC (Benzene Hexachloride), plastics etc.
Which one of the following is a pest?
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Mouse
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Pathogen
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Insect
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All of the above
A pest is an organism with characteristics of damaging or harming its surrounding environment, as it harms agriculture through feeding on crops or parasitizing livestock.
As insecticides reach at higher trophic level in food chain, their concentration
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Increases
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Become irregular
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Remain constant
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Decreases
The use of persistent chemicals has an effect on the food chain. Chemicals that do not break down are passed from one organism to the next and organisms at higher trophic levels tend to accumulate larger amounts than the organisms they feed on. This situation is known as biomagnification.
Pesticides are considered as hazardous because they
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Persist in environment
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Do not enter food chain
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Affect target organism only
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Do not kill natural enemy populations