What are multipurpose trees? Give the botanical and local names of any two multipurpose trees known to you and list their uses.
Multipurpose trees are that which are grown for more than one purpose or benefits. They may provide food in the form of fruit, seeds, or roots; and also provides firewood, medicines, fibres, etc.
(i) Neem (Azadirachta indicd)— Used as insect repellent, antibiotic, firewood and windbreaks.
(ii) Coconut palm (Cocos nucifera)— Used for food, purified water (juice from inside the coconut), roof thatching, firewood, shade and rope making.
In which year was the Air (Prevention and Control of Pollution) Act amended to include noise as air pollution?
Use of lead-free petrol or diesel is recommended to reduce the pollutants emitted by automobiles. What role does lead play?
It is a common practice to plant trees and shrubs near the boundary walls of buildings. What purpose do they serve?
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.
Name any one greenhouse gas and its possible source of production on a large scale. What are the harmful effects of it?
What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river.
Is it true that carpets and curtains/drapes placed on the floor or wall surfaces can reduce noise level. Explain briefly.
Discuss the causes and effects of global warming. What measures need to be taken to control global warming?
Match correctly the following and choose the correct option:
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
Why does ozone hole forms over Antarctica? How will enhanced ultraviolet radiation affect us?
What are multipurpose trees? Give the botanical and local names of any two multipurpose trees known to you and list their uses.
Why has the National Forest Commission of India recommended a relatively larger forest cover for hills than for plains?
What initiatives were taken for reducing vehicular air pollution in Delhi? Has air quality improved in Delhi?
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.
What are the basic characteristics of a modem landfillsite. List any three and also mention the reasons for their use.
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?
Write a short note on electronic waste. List the various sources of e-wastes and the problems associated with its disposal.
What is organic farming? Discuss the benefits of organic fanning as a viable practise in the context of developing nations like India.
What is the main idea behind "Joint Foregt Management Concept"introduced by the Government of India?
Discuss briefly the following:
(a)Greenhouse gases
(b)Catalytic converter
(c)Ultraviolet B
Discuss briefly the following:
(a)Radioactive wastes
(b)Defunct ships and e-wastes
(c)Municipal solid wastes
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?
Observe the figure A and B given below and answer the following questions
(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?
Name an industry which can cause both air and thermal pollution and as well as eutrophication.
Write critical notes on the following:
(a)Eutrophication
(b)Biological magnification
(c)Groundwater depletion and ways for its replenishment
Blends of polyblend and bitumen, when used, help to increase road life by a factor of three. What is the reason?
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.
