SUMMATIVE ASSESSMENT -II SCIENCE CBSE BOARD MANAGEMENT OF NATURAL RESOURCES FOR 10TH

1. India has more than 50,000 strains of rice. Mention the level of biodiversity it represents. [2010]      Ans. It is a genetic variation within the species.

2. Mention the information that the health workers derive by measuring BOD of a water body. [2009]

Ans. BOD (Biological Oxygen Demand) is the amount of oxygen required for biological oxidation of microbes in any unit volume of water.

3. State an instance where human intervention saved the forest from destruction. [2009]

Ans. Chipko movement.

4. Name any two forest products, each of which is the basis for some industry. [2009]

Ans. 

1. Wood : Sports, furniture and paper manufacturing.

2. Resin : Turpentine industry.

5. Why are coal and petroleum considered to be non-renewable sources of energy? [2009]

Ans. Coal and petroleum are considered non-renewable sources of energy because they are not being formed continuously in nature and are, therefore, not replenished. Continuous use will result in their depletion.

6. What is meant by renewable natural resources? [2009]

Ans. Renewable natural resources are replenished regularly and are therefore, likely to remain available indefinitely if they are used judiciously. Example : forests.

7. What are the two kinds of natural resources? [2009]

Ans. (i) Inexhaustible resources that occur in abundance and does not diminish with time.

(ii) Exhaustible resources are likely to reduce with continued exploitation.

8. Which one of the following is a renewable resource? Natural gas, Petroleum, Ground water, Coal. [2008]

Ans. Ground water.

9. Fire wood is our conventional fuel. List any four reasons for replacing it by alternate sources of energy. ]2008]

Ans. (i) It results in deforestation.                        (ii) Small energy value.

       (iii) It is bulky.                                              (iv) More pollution is produced.

10. Which one of the following gases is the major constituent of biogas: CO2, H2, CH4, CO2?[2008]

Ans. CH4 (methane)

11. How is the increase in demand for energy affecting air environment already? [2008]

Ans. The increased consumption of fossil fuels like coal, petroleum and natural gas is releasing a lot of polluting gases such as CO2, CO, SO2 and NO2 some of which are causing green house effect and acid rain.

12.Select two non-biodegradable substances from the following waste generated in a kitchen : Spoilt food, paper bags, milk bags, vegetable peels, tin cans, used tea leaves [2011]
Ans. Non-biodegradable substance are: Milk bags and tin cans.

13. "Burning fossil fuels is a cause of global warming." Justify this statement. [2011]

Ans. Fossil fuels are composed of carbon, hydrogen, nitrogen and sulphur. When these are burnt, the

products are CO2, H2O, oxides of nitrogen and sulphur. Incomplete combustion of fossil fuels produces green house gases such as CO2. If huge amount of fossil fuels are burnt, it would produce high amount of CO2 resulting in intense global warming.

14.List any four stakeholders which may help in the conservation of forests. [2011 ]

Ans. The four main stakeholders are –

(i) People : They live in and around forests and depend on forest produce for various aspects of their lives.

(ii) The government : It owns and controls the resources of forests and wildlife.

(iii) The industrialists : They use forest produce but are not dependent on a forest in any one area
15. Why should we conserve forests? Suggest any two ways to conserve forests. [2008]
Ans. We must conserve forests to preserve the biodiversity because it is the home of a large variety of plants and animals. Two ways to conserve forests are :
(i) Social forestry to meet the demands of community and reduce the stress on forest.
(ii) Afforestation helps in the restoration of the ecological balance.

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