Environmental Studies · Biology

Environmental Health and Toxicology

1,658 Questions

Access targeted questions on environmental health, pollution impacts, and toxicology fundamentals. The topics cover the health effects of air pollution, radiation, and chemical exposure. This material is highly relevant for environmental science tests and general awareness sections of competitive exams.

Air pollution health effectsPesticide exposure risksOzone depletion impactsEnvironmental epidemiologySkin inflammation conditions

Environmental Health and Toxicology Questions

Multiple choice

Directions: The sentence below or part thereof has been underlined. The underlined part may have an error of grammar or diction. Select the option that best corrects the error, if any.

In virtually all types of tissues in every animal species, dioxin induces the production of enzymes that the organisms are trying to metabolize, or render harmless, the chemical that is irritating it.

  1. are trying to metabolize, or render harmless, the chemical that is irritating it

  2. trying that it metabolize, or render harmless, the chemical irritant

  3. attempt to try to metabolize, or render harmless, such as chemical irritant

  4. attempt to metabolize, or render harmless, the chemical irritant

  5. attempting to trying to metabolize or render harmless the chemical that is irritating it

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Organism's cannot be followed by any 'ing' verb, hence (A), (B) and (E) can be eliminated directly; Attempt means to try and both cannot be used together so, (C) is also incorrect.  Hence, the answer is (D)

Multiple choice

Carcinogenic chemicals are those that can cause _____.

  1. allergy

  2. tuberculosis

  3. cancer

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

Carcinogens are substances capable of causing cancer by damaging DNA or disrupting cellular processes. They differ from allergens (immune triggers), tuberculosis-causing bacteria, or anemia-related deficiencies.

Multiple choice

Which of the following is/are the harmful effect(s) of ozone depletion on human beings, animals, plants and environment?

  1. Skin cancer

  2. Damage to the eyes

  3. Increased embryonic mortality in animals and humans

  4. Smog formation

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option as all of the above are the harmful effects of ozone depletion on human beings, animals, plants and environment. This is the correct option as all of the above are harmful effects of ozone depletion on human beings, animals, plants and environment.

Multiple choice

The popular perception is that allergy is not organic in origin and is caused by dust and other allergens that we breathe in. A recent report, however, shows that irrespective of the type of allergens - organic or inorganic - allergy has not much to do with extraneous factors. It is not the exposure or the risk of exposure, but the lack of exposure that is primarily responsible for children and adolescents falling prey to allergies of various kinds.

Which of the following statements best explains the apparent paradox regarding exposure?

  1. Limited exposure helps build up the immune system.

  2. Allergy is internal, not external.

  3. Children and adolescents should be exposed to clean and hygienic environs.

  4. Some of the allergens do not come from the air we breathe.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Immunity to greater hazards is built up by limited exposure. Like vaccination, exposure in small doses builds resistance.

Multiple choice

If a person inhales _________ gaseous pollutant, he suffers from throat irritation, burning of pharynx and oesophagus.

  1. sulphur dioxide

  2. ammonia

  3. hydrogen sulphide

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

In many industries, ammonia gas (NH3) is used as a reducing agent. It is a corrosive gas with a high potentiality of causing throat irritation, burning of pharynx, oesophagus, etc. It can also cause digestive problems when excess gas is inhaled.

Multiple choice

Dust from factories can cause ____________.

  1. jaundice

  2. respiratory problems

  3. cholera

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

Dust and particulate matter from factories are inhaled, which irritates the lungs and causes various respiratory problems like asthma or bronchitis.