Tag: zoology

Questions Related to zoology

Which of the following pesticides is employed widely in antimalarial programmes?

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

  1. Aldrin

  2. Malathion

  3. BHC

  4. None

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Correct Option: B

What is the main problem caused by the use of pesticides?

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

  1. Their residues persists in water and other components of the environment.

  2. Mosquitoes have become resistant to DDT.

  3. They kill silkworm.

  4. They deform the gills of some fishes.

Show answer
Correct Option: A
Explanation:
Pesticides are substances or a mixture of substances of chemical or biological origin, used by human society to mitigate or repel pests such as bacteria, nematodes, insects, mites, mollusks, birds, rodents, and other organisms that affect food production or human health. A major problem with the use of pesticide has been that they do not breakdown in the environment, but remain toxic to fish, animals, and humans for many years.
Thus, the correct answer is option A.

The pesticide used in foundations of buildings for preventing termite attack is

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

  1. DDT

  2. BHC

  3. Aldrin

  4. Endosulfan

Show answer
Correct Option: C
Explanation:

Aldrin is a pesticide used to control soil insects such as termites, corn rootworm, wireworms, rice water weevil and grasshoppers. It has been widely used to protect crops such as corn and potatoe and has been effective to protect wooden structures from termites.

Which pesticide is a herbicide?

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

  1. Malathion

  2. Lindane

  3. BHC

  4. $2, 4$-D

Show answer
Correct Option: D
Explanation:

2,4-D (2,4-Dichlorophenoxyacetic acid) is a systemic herbicide that affects the specifically acts on the dicot weeds. It is used in the crop field of cereals to wipe out the weeds without affecting the monocot cereals. 

A. Malathion is an organophosphate insecticide.
B. Lindane is a hexachlorocyclohexane insecticide.
C. BHC (β-Hexachlorocyclohexane) or lindane is an insecticide.
D. 2,4-D is a herbicide.
Hence, the correct answer is '2,4-D'.

Allethrin is

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

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Correct Option: D
Explanation:

Allethrin is a synthetic pyrenoid used as an insecticide. These were made in 1949 and their chemical structure bears similarity to the natural pyrenoids obtained from the chrysanthemum plants. These are used to kill the flying and crawling insects in homes and workplaces.

Hence, the correct answer is 'Insecticide'.

The most widely used pesticides function by disrupting

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

  1. neurological cellular function

  2. endocrine function

  3. molecular events

  4. renal function

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Correct Option: A

Pesticide pollution is due to 'leachate' from agricultural and

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

  1. Forests

  2. Horticultural land

  3. Mountainous areas

  4. All of above

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Correct Option: B

Lakes which are located downwind from major industrial centers, vulnerable to

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

  1. Eutrophication

  2. Acid Deposition

  3. Air pollution

  4. Urbanization

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Correct Option: B

Synthetic auxin; 2,4,5-T, is rich in which of the following toxic compound?

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

  1. Pyrethrin

  2. Dioxin

  3. Thurioside

  4. Malathion

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Correct Option: B
Explanation:

Auxins are toxic to plants in large concentrations; they are most toxic to dicots and less so to monocots. Because of this property, synthetic auxin herbicides, including 2,4-D and 2,4,5-T, have been developed and used for weed control. Dioxins are environmental pollutants. They belong to the so-called dirty dozen - a group of dangerous chemicals known as persistent organic pollutants (POPs). Dioxins are of concern because of their highly toxic potential. Experiments have shown they affect a number of organs and systems.
Once dioxins enter the body, they last a long time because of their chemical stability and their ability to be absorbed by fat tissue, where they are then stored in the body. Their half-life in the body is estimated to be 7 to 11 years. In the environment, dioxins tend to accumulate in the food chain. The higher an animal is in the food chain, the higher the concentration of dioxins.
The chemical name for dioxin is: 2, 3, 7, 8 - tetrachlorodibenzo para dioxin (TCDD). The name "dioxins" is often used for the family of structurally and chemically related polychlorinated dibenzo para dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs). Dioxins are mainly by-products of industrial processes but can also result from natural processes, such as volcanic eruptions and forest fires. Dioxins are unwanted by products of a wide range of manufacturing processes including smelting, chlorine bleaching of paper pulp and the manufacturing of some herbicides and pesticides.

Which one of the following pesticide is most persistant in the soil?

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

  1. BHC

  2. Pyrethroid

  3. Malathion

  4. None of the above

Show answer
Correct Option: A
Explanation:

Pesticides are applied to the soil to manage the weeds. The length of the time that the pesticide remains active in soil is referred to as "soil persistence". Though desirable in the season of application, its persistence in the soils may affect the crop growth and yield. Benzene Hexachloride(BHC) is a chemical compound with several stereoisomers of which one is an insecticide called Lindane and the by-product is β-hexachlorocyclohexane- the pesticide. This pesticide which was used widely to protect cotton plants during 1960 and 1970's is banned as it has high levels of soil persistence and is neurotoxic for the animals.