Friday, December 21, 2012

CBSE Class 10 - Science - CH 15 - Our Environment (Worksheet)

Our Environment (Worksheet)
ozone layer protects from harmful UV
credits:openclipart

Fill in the blanks

1. Our environment has four components: ________, _________, __________ and ____________.

2. Abnormal increase of the temperature in the environment due to the continuous accumulation of gaseous pollutants is known as __________ _____________.

3. An ecosystem consists of ________components comprising of living organisms and ________ components comprising of physical factors like temperature, rainfall, wind, soil and minerals.

4. __________ is one of the green house gas. It is used as solvent, refrigerants, aerosol spray propellants and in foam packaging.

5. ___________ is the study of relationships between living things and the non-living components.

6.The various components of an ecosystem are ______________ (independent/interdependent).

7. The waste we generate may be ____________ or _____________.

8. The harmful U.V. radiation induces change in ________ which is responsible for ________ cancer.

9. The two things moving through an ecosystem are ________ and ____________.

10. Synthetic (non-biodegradable) wastes when enter the food chain and accumulate in the body of organisms, it is called ______________.

11. An _________ is an artificial and incomplete ecosystem in contrast to a pond which is a natural, self-sustaining and complete ecosystem.

12. ___________ which consume other carnivorous animals constitute third and higher order consumers.

13. Polythense is an example of _____________ waste.

14. Food chains are of two types _________ and ____________.

Answers:
1. atmosphere, hydrosphere, lithosphere and biosphere
2. global warming
3. biotic,  abiotic
4. Chloroflurocarbon (CFC)
5. Ecology or Enviroment Biology
6. interdependent
7. biodegradable, non-biodegradable
8. DNA, skin and/or blood
9. energy, matter
10. biomagnification
11. aquarium
12. Carnivores
13. non-biodegradable
14. grazing food chain, detritus food chain

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