What is a dam? Write two main advantages and two ill-effects of constructing a big dam. [Delhi(C)]
Dams are massive barriers built across rivers and streams to confine and utilise the flow of water for human purposes such as irrigation and generation of electricity.
Two main advantages of constructing a big dam are:
Two ill-effects of constructing a big dam are:
Name the products of combustion of fossil fuels like coal and petroleum products. How do they affect us and our environment ?
(a) What is a natural resource ? Name three important natural resources.
(b) Why do we need to manage our natural resources ?
Why must we conserve our forests? List any two causes for deforestation to take place. [Delhi]
Choose one term from the following which include all others :
coal, natural gas, fossil fuels, petroleum
State two changes you can make in your habits to reduce the consumption of electricity or water. [All IndiaiC)]
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.
(a) Name the major industries which are based on forest produce.
(b) State the main aim of the management of forests and wildlife.
(c) Name the four main stakeholders in the management of forest resources.
State the meaning of “sustainable management”. Reuse is better than recycling. How? [Foreign]
(a) Locate and name the water reservoirs in figures (a) and (b).
(b) Which has an advantage over the other and why?
What are non-renewable resources of energy? Give two examples of such resources. [Delhi]
List any four disadvantages of using fossil fuels for the production of energy. [All India]
Give two examples each of the following:
Which fossil fuel is conserved :Which fossil fuel is conserved :
(a) when we save on electricity ?
(b) when we use bicycle for covering short distances instead of a motorbike ?
Give one example to show how the participation of local people can lead to the efficient management of forests.
How did ‘Chipko Andolan’ ultimately benefit the local people? Describe briefly. [Foreign]
Explain briefly, how rainwater harvesting is done from open spaces around the buildings in city areas.
State an instance where human intervention saved the forests from destruction. [Delhi(Q)]
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]
What is the name of the process in which rainwater falling on the earth is stopped from flowing and made to percolate into the ground ?
Name the person who is most remembered for the protection of Khejri trees in Rajasthan.
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.
What is meant by exploitation of resources with short-term aims? List its four advantages. [Delhi(C)]
What is meant by sustainable management? The environmentalists are insisting upon “sustainable natural resource management”. State its four advantages. [All India (C)]
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]
Why are forests considered “biodiversity hot spots”? List two ways in which an individual can effectively contribute to the management of forests and wildlife. [Foreign; All India 2010]
(a) What is meant by rainwater harvesting ? Name some of the ancient structures used for rainwater harvesting by the rural people.
(b) What are the various advantages of water stored in ground ?
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]
Name the bacteria whose presence in water indicates the contamination with disease-causing micro-organisms.
With which process are the following ancient structures associated ?
Kulhs, Eris, Surangams, Kattas, Pynes
The pH of a river water sample as measured by pH paper is found to be 6. What does it tell us about water ?