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3.contamination of the sources of water

4.all of the above

Q6.What is the process of collecting rain water from rooftops, directing it to an appropriate location,

and storing it for future use called?
1.Irrigation

2.Water replenishment

3.Mulching
4.Rain water harvesting

Q7.Where are silkworms bred?

1.mulberry trees

2.raspberry trees
3.blackberry trees

4.blueberry trees

Q8.What causes contamination of water?
1.discharge of untreated or partially treated sewage, agricultural chemicals, and industrial effluents in

bodies of water

2.treatment of effluents before discharging them into bodies of water
3.fall in the number of industrial effluents entering bodies of water

4.building of canals that dispose effluent waste deep into the oceans

Q9.What does the growth of vegetation primarily depend on?

1.temperature and moisture
2.population and technology

3.technology and moisture
4.technology and temperature

Q10.What is a natural area designated to protect the ecological integrity of one or more ecosystems
for the present and future generations called?

1.a national park

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