Tag: soil pollution-causes

Questions Related to soil pollution-causes

Which of these is made by using chemicals?

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Organic manure

  2. Biofertilizers

  3. Natural insecticides

  4. Pesticides

Show answer
Correct Option: D
Explanation:

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.

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Bioaccumulation 

  2. Calorific value

  3. Population density

  4. All of the above

Show answer
Correct Option: A
Explanation:

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. 

Thus, the correct answer is option A.

The increase in the copy of a gene which expresses itself to release enzyme which breaks the pesticides into less toxic chemicals is a 

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Parasitic mechanism

  2. Protective mechanism

  3. Negative feedback mechanism

  4. All of the above

Show answer
Correct Option: B

Which of the following determines the action of protective enzyme?

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Catalyses the removal of hydrogen atoms from a particular molecule

  2. Phosphorylation of hexose

  3. Breaks the pesticide into less toxic chemicals

  4. Both A and C

Show answer
Correct Option: C

Pests developed with ............. contributes to pests resistance more quickly.

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1.  Shorter generation times

  2. Longer generation times

  3. Shorter lifespan

  4. None of the above

Show answer
Correct Option: A
Explanation:
 Generation time is the average time required to complete one generation. Food quality & temperature are two factors that are responsible to produce an impact on the generation time. Pesticide resistance is the reduced susceptibility of a pest towards a pesticide, which earlier effectively controlled the pest. Hence, pests with short generation time increase rapidly as they develop resistance to pesticides more quickly as compared to pests with longer generation time.
So, the correct answer is 'Shorter generation times'

The development of pesticide resistance indicates that

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. The effect of pesticide has increased

  2. The effect of pesticides has decreased

  3. No effect on the action of pesticides

  4. Gradually increases but the effect of pesticides decreases later on

Show answer
Correct Option: B

DDT is a

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Non-biodegradable pollutant

  2. Biodegradable pollutant

  3. Antibiotics

  4. None of the above

Show answer
Correct Option: A
Explanation:

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?

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Mouse

  2. Pathogen

  3. Insect

  4. All of the above

Show answer
Correct Option: D
Explanation:

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. 

An animal can also be a pest when it causes damage to a wild ecosystem or carries germs. The term pest is used to refer specifically to harmful animals but it also relates to all other harmful organisms, including fungi and viruses. It is possible for an animal to be a pest in one setting but beneficial or domesticated in another.

As insecticides reach at higher trophic level in food chain, their concentration

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Increases

  2. Become irregular

  3. Remain constant

  4. Decreases

Show answer
Correct Option: A
Explanation:

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

zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

  1. Persist in environment

  2. Do not enter food chain

  3. Affect target organism only

  4. Do not kill natural enemy populations

Show answer
Correct Option: A
Explanation:
Pesticides are non biodegradable as they can't be degraded by the action of microbes. They enter the water bodies on runoff from fields and gets accumulated in the bodies of fishes. In this way they enter the food chain and reach the higher trophic levels They enter the body of humans and cause serious health hazards. Hence, for this reason, pesticides are hazardous as they persist in the environment. 
So, the correct answer is 'Persist in environment'.