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.
Because of the excessive use of fertilisers in the fields, they were carried down to the lake during rains. The fertilisers contain phosphates and nitrates, resulting excessive growth of algae and other aquatic plants which float on water surface. The submerged plants are killed due to shading and insufficient availability of dissolved oxygen resulted in the death of fish.
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]
Give two examples each of the following:
Choose one term from the following which include all others :
coal, natural gas, fossil fuels, petroleum
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]
State two changes you can make in your habits to reduce the consumption of electricity or water. [All IndiaiC)]
State the meaning of “sustainable management”. Reuse is better than recycling. How? [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 ?
(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.
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.
What are non-renewable resources of energy? Give two examples of such resources. [Delhi]
Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why ?
(a) Locate and name the water reservoirs in figures (a) and (b).
(b) Which has an advantage over the other and why?
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]
List any four disadvantages of using fossil fuels for the production of energy. [All India]
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]
Give one example to show how the participation of local people can lead to the efficient management of forests.
(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 ?
Although coal and petroleum are produced by degradation of biomass, yet we need to conserve them. Why?
How would these advantages differ from the advantages of using a long-term perspective in managing our resources?
Suggest three ways to maintain a balance between environment and development to survive. [Delhi]
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 ?
Why do you think there should be equitable distribution of resources? What forces would be working against an equitable distribution of our resources?
Suggest any four changes that you would like to incorporate in the life style of students of your age to move towards a sustainable use of available resources. [All India Delhi 2008(C)]
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 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)]