Environmental Issues

NEET Biology · 109 questions · Page 1 of 11 · Click an option or "Show Solution" to reveal answer

World Ozone Day is celebrated on

A 5 th June

B 21 st April

C 16 th September

D 22 nd April

Correct Answer

Option C

Solution

World Ozone day is celebrated on 16 th September.

Which of the following is a secondary pollutant?

A CO

B CO 2

C SO 2

D O 3

Correct Answer

Option D

Solution

A primary pollutant is an air pollutant emitted directly from a source.

A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.

O 3 (ozone) is a secondary pollutant.

In stratosphere, which of the following elements acts as a catalyst in degradation of ozone and release of molecular oxygen?

A Carbon

B Cl

C Fe

D Oxygen

Correct Answer

Option B

Solution

UV rays act on chlorofluorocarbons (CFCs) releasing active chlorine (Cl, ClO) which further reacts with ozone in sequential manner thereby converting it into oxygen.

A location with luxuriant growth of lichens on the trees indicates that the :

A trees are very healthy

B trees are heavily infested

C location is highly polluted

D location is not polluted

Correct Answer

Option D

Solution

Lichens are very good pollution indicators, they do not grow in pollutted areas.

They are sensitive to sulphur dioxide pollution.

Increase in concentration of the toxicant at successive trophic levels is known as :

A Biomagnification

B Biotransformation

C Biodeterioration

D Biogeochemical cycling

Correct Answer

Option A

Solution

Biomagnification means an increase in concentration of toxins through the trophic levels of a food chain.

The UN conference of Parties on climate change in the year 2012 was held at :

A Lima

B Warsaw

C Doha

D Durban

Correct Answer

Option C

Solution

This conference occured from 20 Nov to 8 December, 2012 to extend the life of the Kyoto Protocol at Doha in Qatar.

Nitrates and phosphates flowing from agricultural farms into water bodies are a significant cause of :

A Eutrophication

B Humification

C Mineralisation

D Stratification

Correct Answer

Option A

Solution

Eutrophication is a process where water bodies receive excess nutrients that stimulate excessive plant growth (algae, phytoplankton, and nuisance plants weeds).

Nitrates and phosphates are two essential nutrients that can cause eutrophication when present in large amounts.

What will happen if fresh water lake gets contaminated by addition of polluted water with high BOD?

A Amount of dissolved oxygen in the lake will decrease

B The lake will remain unaffected

C Number of submerged aquatic plants in the lake will increase

D Number of aquatic animals in the lake will increase

Correct Answer

Option A

Solution

If a lake is contaminated with polluted water that has high BOD, bacteria consume oxygen during decomposition.

This leads to a decrease in the amount of dissolved oxygen in the water, which can cause aquatic organisms to die.

The thickness of ozone in a column of air in the atmosphere is measured in terms of :

A Decibels

B Decameter

C Kilobase

D Dobson units

Correct Answer

Option D

Solution

The thickness of the ozone in a column of air from the ground to the top of the atmosphere is measured in terms of Dobson units (DU).

Noise is measured in decibels.

Q10

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for :

A Construction of roads

B Making tubes and pipes

C Making plastic sacks

D use as a fertilizer

Correct Answer

Option A

Solution

Polyblend is a fine powder of recycled modified plastic.

Polyblend is mixed with the bitumen and is used to lay roads.

Blend of Polyblend and bitumen enhances the bitumen's water repellant properties and helps to increase road life.

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