Tag: zoology

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Questions Related to zoology

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

Resistance to insecticides was first documented by

  1. J.C bose

  2. A.K Chakraborty

  3. A. L. Melander

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A. L. Melander is historically credited with the first documented case of insect resistance to an insecticide, specifically the San Jose scale's resistance to lime sulfur in 1914.

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

Spraying of D.D.T. on crops produces pollution of

  1. Air only

  2. Air and soil only

  3. Air, soil and water

  4. Air and water only
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Some of the common pollutants are non biodegradable, e.g : persistent pesticides like organochlorine or chlorinated hydrocarbons like DDT. These chemicals pass into food chains and increase in amount per unit weight of organisms with the rise in trophic level due to their accumulation in animal fats. Higher the trophic level of an organism in the food chain, greater will be the accumulation of pollutant. As these chemicals are persistent and non biodegradable, they pollute air, soil and water and in which ever organism they reach they simply keep on increasing in concentration. The phenomenon is called biomagnification. 

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

The pesticide used as preventive measure in buildings is

  1. Aldrin

  2. Dieldrin

  3. Endrin

  4. DDT
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pesticides are important pollutants of soil. They include insecticides, fungicides, algicides, rodenticides and weedicides. Pesticides are generally broad spectrum and function as biocides. Organochlorines and chlorinated hydrocarbons are an important class of pesticides. The important ones are dichloro diphenyl trichloroethane (DDT), Benzene hexachloride (BHC), aldrin, dieldrin and endrin. They are persistent, fat soluble, and show biomagnification and hence, are harmful to higher trophic level of organisms. Aldrin was used in buildings to protect against insects, such as termites.

So, the correct answer is option A.

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

Among pesticides, zinc phosphide is used for 

  1. As rodenticide bait

  2. Fumigation

  3. Both A and B

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Zinc phosphide is a highly potent rodenticide. It has a wide range of uses commercially and residentially, including the protection of food crops and grasses. As a rodenticide, it can kill mice and voles and also be used as a fumigant in storehouse to control post - harvest pests such as rice weevils, grannary weevils, wheat moths, cotton red bollworms etc.

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

Consider the following four measures (A-D) that could be taken to successfully grow chickpea in an area, where bacterial blight disease is common.
A. Spray with Bordeaux mixture.
B. Control of the insect vector of the disease pathogen.
C. Use of only disease free seeds.
D. Use of varieties resistant to the disease.


Which two of the above measures can control the disease?

  1. C and D

  2. A and D

  3. B and C

  4. A and B
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Bacterial blight is a serious disease of field peas that is caused by the pathogen Pseudomonas syringae. It can be controlled by crop rotation, time of sowing, farm hygiene, sowing disease free seed and using resistant varieties.

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

DDT and 2,4-D were introduced

  1. Towards end of World War II

  2. Towards beginning of World War II

  3. During World War I

  4. Just after the World War I
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Paul Muller discovered that DDT (chemically, dichloro-diphenyl-trichloro-ethane) would kill insects in 1939 and used extensively by the U.S. military during the war. DDT led the way to develop other insecticides and herbicides. 

One of the first and most important was the weed killer or "herbicide" known as 2,4-D. It was developed in 1944. Many historians have called 'post second world war' period as the golden age of chemical pesticides.

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

Pyrethrin is extracted from 

  1. Chrysanthemum cinerarifolium

  2. Azadirachta indica

  3. Derris elliptica

  4. Ryania speciosa
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Pyrethrum is an insecticide which is obtained from the inflorescence of Chrysanthemum cinerarifolium, C. coccineum and C. marshallii. The active compounds are pyrethrin and cinerin. Azadirachtin is obtained from Azadirachta indica. Rotenones are obtained from the roots of Derris elliptica. Ryanodine is isolated from Ryania speciosa. All these compounds are naturally occurring insecticides.
Thus, the correct answer is option A.
Multiple choice zoology soil pollution industrial chemicals and their harmful effects toxic wastes and their effects soil pollution-causes

Which one of the following pesticide is banned these days?

  1. Aldrin

  2. Endrin

  3. DDT

  4. Toxaphene
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DDT was banned because of concern over carcinogenicity, bioaccumulation and health effects on wildlife. In addition to these concerns, resistance to DDT occurs in some insects (like the house fly) that develop the ability to quickly metabolize DDT into the lower toxicity breakdown product DDE. DDT affects the nervous system by interfering with normal nerve impulses. DDT causes the nerve cells to repeatedly generate an impulse which accounts for the repetitive body tremors seen in exposed animals.

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

The chemical used in National Malaria Eradication Programme is

  1. 2, 4-D

  2. BHC

  3. DDT

  4. Pyrethroid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

DDT was used for malaria control at the end of WWII. National Malaria Eradication Programme (NMEP), started an attack phase for indoor residual spraying of DDT which resulted in malaria eradication. As a collateral benefit, DDT eliminated kala - azar and plague and wiped out nuisance of household insects. Such a spectacular success made the use of DDT popular.