Name two factors which can be used to find whether river water has been contaminated.
In a village in Karnataka, people started cultivating crops all around a lake which was always filled with water. They added fertilisers to their field in order to enhance the yield. Soon they discovered that the water body was completely covered with green floating plants and fishes started dying in large numbers. Analyse the situation and give reasons for excessive growth of plants and death of fish in the lake.
Apart from the availability of forest products, name two other things which are affected by the destruction of forests.
Suggest three ways to maintain a balance between environment and development to survive. [Delhi]
Name the rivers with which the following dams are associated :
Name the rivers with which the following dams are associated :
(a) Tehri Dam
(b) Sardar Sarovar Dam
(c) Bhakra Dam
(a) Name any five sources of water (other than rivers)
(b) Describe how, the water of river Ganga has been highly polluted.
Give two examples each of the following:
Why do you think there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
State two changes you can make in your habits to reduce the consumption of electricity or water. [All IndiaiC)]
(a) State the advantages of constructing dams across the rivers.
(b) Describe some of the problems associated with the construction of dams.
Why must we conserve our forests? List any two causes for deforestation to take place. [Delhi]
Name the products of combustion of fossil fuels like coal and petroleum products. How do they affect us and our environment ?
Explain briefly, how rainwater harvesting is done from open spaces around the buildings in city areas.
What is an equitable distribution of resources in a society and why is it necessary? State any two factors which work against an equitable distribution of resources. [Foreign]
(a) What is a natural resource ? Name three important natural resources.
(b) Why do we need to manage our natural resources ?
Fill in the following blanks with suitable words :Fill in the following blanks with suitable words :
(a) LPG is a ……………fuel but biogas is not a…………. fuel.
(b) Glaciers are a source of…………………..
(c) One of the main aim of management of forests and wildlife is to conserve the……………….which we haveinherited.
(d) Khadin is a traditional………………………..harvesting system in Rajasthan.
(e) When a fuel burns in an insufficient supply of air, then some poisonous gas called ……………………….. is also produced.
State any four personal choices you would like to make to reduce energy consumption without affecting the quality of life or work explaining how each one of them would help you to do so. [Foreign]
State the meaning of “sustainable management”. Reuse is better than recycling. How? [Foreign]
An environmentalist on visit to your school suggested the use of three R’s to save the environment. Explain what he meant by three R’s and how you would follow his advice at home. [All India]
List any two causes of our failure to sustain availability of underground water.[Foreign]
What are non-renewable resources of energy? Give two examples of such resources. [Delhi]
Which of the two is a better option, (i) to collect rainwater in ponds or artificial lakes, or (ii) to let it recharge groundwater by water harvesting? List two advantages of the option to justify your answer. [Foreign]
Explain why, despite good rains, we are not able to meet the demand for water of all the people in our country.
What is a dam? Write two main advantages and two ill-effects of constructing a big dam. [Delhi(C)]
List three problems which arise due to construction of big dams. Suggest a solution for these problems. [All India]
State whether the following statement is true or false :
Chipko Andolan was associated with the conservation of wild animals such as tigers and lions.
List the products of combustion of fossil fuels. What are their adverse effects on the environment? [All India]
How did ‘Chipko Andolan’ ultimately benefit the local people? Describe briefly. [Foreign]