Biology

Environmental Issues

Question:

It is a common practice to undertake desilting of the overhead water tanks. What is the possible source of silt that gets deposited in the water tanks?

Answer:

The soil particles carried by water from the source of supply.

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Environmental Issues

Q 1.

What is an algal bloom?

Q 2.

In which year was the Air (Prevention and Control of Pollution) Act amended to include noise as air pollution?

Q 3.

What is the raw material for polyblcnd?

Q 4.

Use of lead-free petrol or diesel is recommended to reduce the pollutants emitted by automobiles. What role does lead play?

Q 5.

Name the city in our country where the entire public road transport runs on CNG.

Q 6.

It is a common practice to plant trees and shrubs near the boundary walls of buildings. What purpose do they serve?

Q 7.

Name any one greenhouse gas and its possible source of production on a large scale. What are the harmful effects of it?

Q 8.

Water logging and soil salinity are some of the problems that have come in the wake of the Green Revolution. Discuss their causes and adverse effects to the environment.

Q 9.

What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.

Q 10.

Is it true that carpets and curtains/drapes placed on the floor or wall surfaces can reduce noise level. Explain briefly.

Q 11.

Match correctly the following and choose the correct option:
ncert-exemplar-problems-class-12-biology-environmental-issues-2
The correct matches is
(a) i”C, ii”D, iii”A, iv”B (b) i”A, ii”C, iii”B, iv”D
(c) i”D, ii”A, iii”B, iv”C (d) i”C, ii”D, iii”B, iv”A

Q 12.

List any two adverse effects of particulate matter on human health.

Q 13.

Why does ozone hole forms over Antarctica? How will enhanced ultraviolet radiation affect us?

Q 14.

What is hybrid vehicle technology? Explain its advantages with a suitable example?

Q 15.

Discuss the causes and effects of global warming. What measures need to be taken to control global warming?

Q 16.

It is a common practice to undertake desilting of the overhead water tanks. What is the possible source of silt that gets deposited in the water tanks?

Q 17.

What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?

Q 18.

What are multipurpose trees? Give the botanical and local names of any two multipurpose trees known to you and list their uses.

Q 19.

Why has the National Forest Commission of India recommended a relatively larger forest cover for hills than for plains?

Q 20.

Write a short note on electronic waste. List the various sources of e-wastes and the problems associated with its disposal.

Q 21.

Is it true that if the dissolved oxygen level drops to zero, the water will become septic? Give an example which could lower the dissolved oxygen content of an aquatic body.

Q 22.

What are the basic characteristics of a modem landfillsite. List any three and also mention the reasons for their use.

Q 23.

Mention any two examples of plants used as wind breakers in the agricultural fields.

Q 24.

How has DDT caused decline in bird population?

Q 25.

Match the items given in column A and B:
ncert-solutions-for-class-12-biology-environmental-issues-1

Q 26.

What is the best solution for the treatment of electronic wastes?

Q 27.

What is organic farming? Discuss the benefits of organic fanning as a viable practise in the context of developing nations like India.

Q 28.

Discuss briefly the following:
(a)Greenhouse gases
(b)Catalytic converter
(c)Ultraviolet B

Q 29.

What is the main idea behind "Joint Foregt Management Concept"introduced by the Government of India?

Q 30.

What do you understand by biomagnification?

Q 31.

Discuss briefly the following:
(a)Radioactive wastes
(b)Defunct ships and e-wastes
(c)Municipal solid wastes

Q 32.

Observe the figure A and B given below and answer the following questions
ncert-exemplar-problems-class-12-biology-environmental-issues-6
(i) The power generation by the above two methods is non-polluting. True/False
(ii) List any two applications of solar energy.
(iii) What is a photovoltaic cell?

Q 33.

List all the wastes that you generate, at home,school or during your trips to other places. Could you very easily reduce the generation of these wastes? Which would be difficult or rather impossible to reduce?

Q 34.

Discuss the role of women and communities in protection and conservation of forests.

Q 35.

What measures, as an individual, would you take to reduce environmental pollution?

Q 36.

Name an industry which can cause both air and thermal pollution and as well as eutrophication.

Q 37.

What is cultural eutrophication?

Q 38.

Write critical notes on the following:
(a)Eutrophication
(b)Biological magnification
(c)Groundwater depletion and ways for its replenishment

Q 39.

Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason?

Q 40.

What are the three major kinds of impurities in domestic wastewater?

Q 41.

What do you understand by Snow-blindness?

Q 42.

What is reforestation?  

Q 43.

How can slash and bum agriculture become environment friendly?

Q 44.

Observe figure and answer the followiag,questions.
(i) What ecological term is used to describe the DDT accumulation at different trophic levels?
(ii) list any one effect of DDT accumulation on birds.
(iii) Will DDT accumulation lead to eutrophication?
Does it affect the BOD?
Name disease caused by accumulation of any heavy metal.

Q 45.

How does an electrostatic precipitator work?