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

In a certain field, insecticides were sprayed to kill pests, but then there was sudden decrease of yield of food crop, this may be due to

  1. Pesticides killed flowers.

  2. Pesticides changed female to male flowers.

  3. Pesticides hindered fertilization.

  4. Pesticides killed those insects and also which helped in pollination.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pesticides have had some of their most striking effects on birds, particularly those in the higher trophic levels of food chains, such as bald eagles, hawks and owls. These birds are often rare, endangered and susceptible to pesticide residues, such as those occurring from the bioconcentration of organochlorine insecticides through terrestrial food chains. Pesticides may kill grain and plant-feeding birds and the elimination of many rare species of ducks and geese has been reported. Populations of insect-eating birds, such as partridges, grouse and pheasants have decreased due to the loss of their insect food in agricultural fields through the use of insecticides. Thus, the correct answer is option D.

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

In USA, the return of brown pelican, is the result of banning the use of which of the following pesticide?

  1. 2, 4-D

  2. DDT

  3. Bordeaux mixture

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

In 1972, the 'Environmental Protection Agency' banned the use of DDT in the United States as well as the use of pesticides, such as endrin and dieldrin. As a result, the levels of these persistent compounds in the environment have decreased in most areas, thus, the reproductive success of brown pelicans has increased.

Thus, the correct answer is option B.

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

Pests which only feed and oviposit on crop are called as

  1. Major pest

  2. Minor pest

  3. Accidental pest

  4. Occasional pest
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Minor pests are the species that feed or oviposit on the crop plants but usually do not inflict damage of economic importance and often their effect on the plant is indiscernible.
A pest is "a plant or animal detrimental to humans or human concerns (as agriculture or livestock production)"; alternative meanings include organisms that cause nuisance and epidemic disease associated with high mortality.

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

Milk vine weed is being eradicated from citrus with the help of which of the following herbicide?

  1. 2, 4 - D

  2. Phytophthora palmivora

  3. Pyrethrin

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

Phytophthora palmivora has been used as an post emergent mycoherbicide to control milkweed or strangler vine, a major problem on citrus in south Florida. It controls the weed by a root and stem rot and girdling the stems of infested plant near the soil surface, resulting in the death of seedlings and the older plants.

Thus, the correct answer is option B.

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

The herbicide mixture rich in 2,4-D and 2,4,5-T with TCDD being carcinogenic and teratogenic, used by Americans in Vietnam war in 1961-71, was

  1. Agent orange

  2. Triazines

  3. Organophosphates

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

Agent orange was a powerful mixture of chemical defoliants used by U.S. military forces during the Vietnam war to eliminate forest cover for north Vietnamese, as well as crops that might be used to feed them. The U.S. program of defoliation, codenamed Operation Ranch Hand, sprayed more than 19 million gallons of herbicides over 4.5 million acres of land in Vietnam from 1961 to 1972.

Agent orange, which contained the chemical dioxin, was the most commonly used of the herbicide mixtures, and the most effective. It was later revealed to cause serious health issues–including tumors, birth defects, rashes, psychological symptoms and cancer–among returning U.S. servicemen and their families as well as among the Vietnamese population.
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

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. b and c

  2. a and b

  3. c and d

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

Bacterial blight is a serious disease of field peas that is caused by the pathogens Pseudomonas syringae pv. pisi and Pseudomonas syringae pv. syringae. 

It can be controlled by crop rotation, time of sowing, farm hygiene, sowing disease free seed and using resistant varieties.The disease is characterized by small, pale green spots or streaks which soon appear water-soaked. The lesions expand and then appear as dry dead spots. In severe infections, a milky gray exudate may be squeezed from the cut end of leaf exhibiting symptoms.
It can be prevented by use of only disease-free seeds and use of varieties resistant to the disease.

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

Which of the following is a chlorinated hydrocarbon?

  1. Malathion

  2. Pyrethrum

  3. Aldrin

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

Aldrin is an organochlorine insecticide that was widely used until the 1970s, when it was banned in most countries. It is a colourless solid. Before the ban, it was heavily used as a pesticide to treat seed and soil. It is a chlorinated hydrocarbon. Thus, option C is correct. A carbamate is an organic compound derived from carbamic acid (NH2COOH). Thus, option D is wrong. Malathion is an organophosphate parasympathomimetic which binds irreversibly to cholinesterase. Malathion is an insecticide of relatively low human toxicity. It is not a chlorinated hydrocarbon. Thus, option A is wrong. Pyrethrum was a genus of several Old World plants now classified as Chrysanthemum or Tanacetum which are cultivated as ornamentals for their showy flower heads. Thus, option B is wrong. 

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

The bioconcentration of DDT in the body fat of Indian people is

  1. 18-36 ppm

  2. 5-10 ppm

  3. 13-31 ppm

  4. 2-5 ppm
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Most of organochlorine pesticides are highly soluble in fat of animals. Further, these chemicals are resistant to be metabolized, so they start accumulating in the bodies of animals. 

In India due to prolonged use of DDT, 13-31 ppm of DDT can be detected in the body fat of people, which is highest in the world. Thus, the correct answer is option C.