Environmental Issues · Question 1

Which one of the following statements is NOT correct?

1. Algal blooms caused by excess of organic matter in water improve water quality and promote fisheries
2. Water hyacinth grows abundantly in eutrophic water bodies and leads to an imbalance in the ecosystem dynamics of the water body
3. The amount of some toxic substances of industrial waste water increases in the organisms at successive trophic levels
4. The micro-organisms involved in biodegradation of organic matter in a sewage polluted water body consume a lot of oxygen causing the death of aquatic organisms

Which of the following statements is correct?

1. Biomagnification refers to increase in concentration of the toxicant at successive trophic levels.
2. Presence of large amount of nutrients in water restricts ‘Algal Bloom’
3. Algal Bloom decreases fish mortality
4. Eutrophication refers to increase in domestic sewage and waste water in lakes.

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are incorrect.
2. Statement I is correct but Statement II is incorrect.
3. Statement I is incorrect but Statement II is correct.
4. Both Statement I and Statement II are correct.

The device which can remove particulate matter present in the exhaust from a thermal power plant is:

1. STP
2. Incinerator
3. Electrostatic Precipitator
4. Catalytic Converter

The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?

1. CNG burns more efficiently than diesel
2. The same diesel engine is used in CNG buses making the cost of conversion low
3. It is cheaper than diesel
4. It cannot be adulterated like diesel

Given below are two statements: In the light of the above statements, choose the most appropriate answer from the options given below:

1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

Why CNG is considered better fuel than diesel? Choose the most appropriate answer from the options given below :

1. C, D and E only
2. A, B, C and E only
3. A, C and D only
4. A, B, D and E only

Dobson units are used to measure thickness of :

1. Troposphere
2. CFCs
3. Stratosphere
4. Ozone

Snow-blindness in Antarctic region is due to

1. High reflection of light from snow
2. Freezing of fluids in the eye by low temperature
3. Inflammation of cornea due to high dose of UV-B radiation
4. Damage to retina caused by infra-red rays

Montreal protocol was signed in 1987 for control of

1. Disposal of e-wastes
2. Transport of Genetically modified organisms from one country to another
3. Emission of ozone depleting substances
4. Release of Green House gases