Environmental Science and Ecology - Mock Test 25

Question 241

BOD is connected with ?

A) Microbes B) Organic matter C) Microbes and organic matter D) None of these

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Question 242

Biochemical Oxygen Demand (BOD) in a river water ?

A) Increases when sewage gets mixed with river water B) Remains unchanged when algal bloom occurs C) Has no relationship with concentration of oxygen in the water D) Gives a measure of salmonella in the water

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Question 243

Attack of asthma in certain persons may be due to ?

A) Exposure to cold temperature B) Inhalation of some air borne pollen C) Eating of some seasonal vegetables D) Low concentration of CO2 due to increased rate of photosynthesis

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Question 244

Among the following, a secondary pollutant is ?

A) PAN B) SO2 C) CO D) Aerosol

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Question 245

Addition of phosphates and nitrates/fertilizers into water leads to ?

A) Increased algal growth B) Nutrient enrichment (eutrophication) C) Reduced algal growth D) Increased growth of decomposers

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Question 246

Acid rain is caused by increase in the atmospheric concentration of ?

A) Ozone and dust B) SO2 and NO2 C) SO3 and CO D) CO2 and CO

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Question 247

According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?

A) 5.2 - 2.5 B) 2.5 or less C) 1.5 or less D) 1.0 or less

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Question 248

A disease affecting industrial workers is ?

A) Silicosis B) Fluorosis C) Asthma D) None of these

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Question 249

Which one of the following pairs of gases are the major causes of "Greenhouse Effect"?

A) CO2 and N2O B) CO2 and O3 C) CO2 and CO D) CFCs and SO2

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Question 250

The pyramid of energy is always upright for any ecosystem. This situation indicates the fact that ?

A) Herbivores have a better energy conversion efficiency than carnivores. B) Producers have the lowest energy conversion efficiency. C) Carnivores have better energy conversion efficiency than herbivores. D) Energy conversion efficiency is the same in all trophic levels.

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