Tag: zoology

Questions Related to zoology

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'.

To which class of pesticides do DDT, BHC, aldrin and endosulphan belong?

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

  1. Carbamates

  2. Organophosphates

  3. Organochlorines

  4. Biopesticides

Show answer
Correct Option: C
Explanation:

Organochlorines are very slowly decomposing chlorinated organic compounds, which are lipophilic (show much affinity for the fatty tissue of animals). Examples of Organochlorines are DDT, BHC, Aldrin, Endosulphan etc. So, the correct option "C" (Organochlorines).

Trichoderma is known 


a. To have no adverse effect on crop plants.
b. To be a broad spectrum pesticide.
c. As free living fungi in symbiotic association with roots.
d. To be applied as spray on Brassica leaves.

Select the correct statement.

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

  1. a, b, & d

  2. a, b & c

  3. a & b

  4. a & c

Show answer
Correct Option: A
Explanation:

  • Trichoderma is the most prevalent culturable soil dwelling fungi. It has no adverse effect on crop plants.
  • It is used as bio fungicide and control agent for bacteria and fungi. Hence, it is a broad spectrum pesticide.
  • It forms symbiotic association with the roots of the plants and is not found free living in the soil.
  • The dried spores of Trichoderma are sprayed on Brassica leaves to kill Alternaria that causes blight of mustard.
Hence, statements a, b and d are correct.
So, the correct answer is 'a,b and d'.

The third generation pesticide amongst the following is

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

  1. JH analogues

  2. Pheromones

  3. Insect propellants

  4. Pathogens

Show answer
Correct Option: A
Explanation:

Third generation pesticide is defined as biodegradable, water soluble pesticide, which are more toxic.
Analogues of the juvenile hormone (JH) are used as an insecticide, preventing the larvae from developing into adult insects. JH itself is expensive to synthesize and is unstable in light. At high levels of JH, larvae can still molt, but the result will only be a bigger larva, not an adult. Thus, the insect's reproductive cycle is broken.  

Thus, the correct answer is option A.

When a natural predator (living being) is applied on the other pathogenic organism to control them, this process is called as

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

  1. Biological control

  2. Genetic engineering

  3. Artificial control

  4. Confusion technique

Show answer
Correct Option: A
Explanation:

Biological control is a bioeffector-method of controlling pests (including insects, mites, weeds and plant diseases) using other living organisms. It relies on predation, parasitism, herbivory or other natural mechanisms, but typically also involves an active human management role.

Thus, the correct answer is option A.

Alletherin is a commonly used as

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

  1. Fertilizer

  2. Herbicide

  3. Growth hormone

  4. Insecticide

Show answer
Correct Option: D
Explanation:

The allethrins are a group of related synthetic compounds used in insecticides. They are synthetic pyrethroids, a synthetic form of a chemical found naturally in the Chrysanthemum flower.

Thus, the correct answer is option D.

Name one frequently used fungicide from the following.

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

  1. Griseofulvin

  2. Chloramphenicol

  3. Cycocel

  4. Ethylene

Show answer
Correct Option: A
Explanation:

Griseofulvin is an orally administered antifungal drug. It is used both in animals and humans, to treat fungal infections of the skin (commonly known as ringworm) and nails. It is produced by culture of some strains of the mold Penicillium griseofulvum, from which it was isolated in 1939.