Name two fossil fuels.

Name the major programme started to replenish forests.

Apart from the availability of forest products, name two other things which are affected by the destruction of forests.

Name the rivers with which the following dams are associated:

(a) Tehri Dam

(b) Sardar Sarovar Dam

(c) Bhakra Dam

Name two factors which can be used to find whether river water has been contaminated.

Name the bacteria whose presence in water indicates the contamination with disease-causing micro-organims.

With which process are the following ancient structures associated?

Kulhs, Eris, Surangams, Kattas, Pynes

Which fossil fuel is conserved :

(a) when we save on electricity?

(b) when we use bicycle for covering short distances instead of a motorbike ?

What is the main purpose of rainwater harvesting ?

What is the name of the process in which rain water falling on the earth is stopped from flowing and made to percolate into the ground ?

Name the most common practice of recharging ground water.

The pH of a river water sample as measured by pH paper is found to be What does it tell us about water?

Name the person who is most remembered for the protection of Khejri trees in Rajasthan.

State whether the following statement is true or false :

Chipko Andolan was associated with the conservation of wild animals such as tigers and lions.

Write the full names of

(a) CFL, and (b) CFC.

Choose one term from the following which include all others :

coal, natural gas, fossil fuels, petroleum

Why is the process of 'reuse' better than that of 'recycling' ?

Name a clean gaseous fuel other than LPG and natural gas.

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 hav inherited.

(d) Khadin is a traditional ............ harvesting system in Rajasthan.

(e) When a fuel bums in an insufficient supply of air, then some poisonous gas called ........ is also produced.

What is meant by "sustainable development"?

What is silviculture? What are its advantages?

Write a short note on 'Chipko Andolan' (Hug the Trees Movement).

Why' should we conserve forests and wildlife?

Describe briefly the 'khadin' system of rainwater harvesting practised in Rajasthan.

What measures would you take to conserve electricity in your house?

Although coal and petroleum are produced by the degradation of biomass, even then we need to conserve them. Why?

Is water conservation necessary? Give reasons.

Name the products of combustion of fossil fuels like coal and petroleum products. How do they affect us and our environment?

Why should fossil fuels like coal and petroleum be used judiciously?

What are the three R's to save the environment? Explain with one example of each.

What are the main uses of coal and petroleum products?

State any five steps to reduce the consumption of coal and petroleum products.

Explain why, despite good rains, we are not able to meet the demand for water of all the people in our country.

Give one example to show how the participation of local people can lead to the efficient management of forests.

Explain briefly, how rainwater harvesting is done from open spaces around the buildings in city areas.

What is a natural resource? Name three important natural resources.

Why do we need to manage our natural resources?

State the advantages of constructing darns across the rivers.

Describe some of the problems associated with the construction of darns.'

Name any five sources of water (other than rivers)

Describe how, the water of river Ganga has been highly polluted.

Name the major industries which are based on forest produce.

State the main aim of the management of forests and wildlife.

Name the four main stakeholders in the management of forest resources.

What is meant by rainwater harvesting? Name some of the ancient structures used for rainwater harvesting by the rural people.

What are the various advantages of water stored in ground ?

The Bishnoi community of Rajasthan is associated with the conservation of :

The Chipko Andolan is associated with :

Arnrita Devi Bishnoi was associated with :

One of the following is not a direct stakeholder in the management (or conservation) of forests. This is :

The river water is said to be polluted with acidic wastes if the pH of river water is :

The major programme started to replenish the damaged forests is called :

With which tree Amrita Devi Bishnoi is associated?

One of the following does not contribute in producing acid rain. This one is :

The poisonous gas which reduces the oxygen-carrying capacity of blood to a large extent is :

Which of the following is not an ancient water harvesting structure ?

Snakes are killed in large numbers because :

Which of the following is not a fossil fuel ?

Which of the following is not a natural resource ?

The most rapidly dwindling natural resource in the world is :

Which of the following is not a natural resource ?

The three. R's which can help us to conserve natural resources for long term use are:

The main reason for the abundant coliform bacteria in the water of river Ganga is :

The pH of a sample of water collected from a river is found to be in the range of 3.5 to 4.5. The most likely reason for this is the waste being discharged into the river from a :

Which of the following statement is incorrect ?

Arabari forest of Bengal is dominated by :

Groundwater will not be depleted due to :

Ahars, Kattas, Bhundhis and Khadins are the modes of :

Which of the following combination of terms has no fossil fuel ?

The use of one of the following is eco-friendly. This one is :

Khadins are used in Rajasthan to :

In a village, farmers started cultivating crops all around a lake which was always filled with water. They added lot of materials W to the soil in their fields to increase the yield of crops. Soon they found that the whole surface of water in the lake was covered with a green layer made up of tiny organisms X. After some time, the fish present in the lake started dying in large numbers because they could not get sufficient Y due to a process Z which had occurred in lake water and drained out all the Y present in the water of lake.

(a) What do you think materials W are ?

(b) Name (i) X, and (ii) Y.

(c) What is the process Z known as?

(d) What happens during the process Z which uses up all the Y present in lake water?

(e) What does this example tell us about the use of materials like W?

There were lot of organisms A in the crop fields in an area. These organisms used to feed on organisms B also present in the crop fields but which damaged the standing crops. One day some people arrived in the fields and killed all the organisms A so that they could remove their C for making fancy items which were in great demand. Due to large scale killing of A, the population of B increased too much damaging all the crops in the area and causing a famine-like situation. Apart from A, there is another organism D which can also kill and eat B. Name A, B, C and D.

There are two important fuels A and B both of which are extracted from deep inside the earth. Fuel A is a thick, dark, foul smelling liquid whereas fuel B is a black solid. Combustion of both the fuels produces products, C, D, E and F. The product C makes the rainwater only slightly acidic but it is mainly responsible for causing global warming. The product D is neither acidic nor basic. It is harmless and does not affect the environment in any way. Both E and F attack breathing system of humans and are mainly responsible for causing acid rain. In addition to combustion of fuels A and B, the product F is also formed when lightning occurs in the sky.

(a) What are (i) fuel A, and (ii) fuel B ? (b) Name (i) C (ii) D (iii) E, and (iv) F

(c) What is the process of formation of F during lightning known as ?

(d) Which fuel is supposed to be exhausted sooner : A or B ?

(e) Which fuel is mostly used for generating electricity at thermal power plants ?

A man bought a device X which could cook pulses, vegetables and rice without using any fuel like wood, coal, kerosene or LPG, etc. This device did not work at night. It also took a lot of time for cooking.

(a) Name the device X.

(b) What is the source of energy which cooks food in this device?

(c) What is the name of the process which traps energy in this device?

(d) State one advantage (other than saving on fuel) of using such a device for cooking food.

A person buys two electrical devices P and Q for lighting purposes in his house. The device P consumes only 5 units of electricity in a month but device Q consumes 15 units of electricity in a month when used for the same number of hours daily. The device Q wastes a lot of electricity by radiating energy C but P does not do so.

(a) What type of device is (i) P, and (ii) Q?

(b) Name one component which is present in Q but not in P.

(c) Name the energy C.

(d) Which device is more energy efficient: P or Q ?

(e) Which fossil fuel is most likely to be conserved if all of us switch over to devices like P?