(1)How does river water get polluted? Explain.
(2)Identify any three ecological problems caused by building large dams,
(3)Explain any five factors responsible for the formation of soil.
(4)What is meant by land use pattern? Why is it important to study the land use pattern? List t
nfluencing the utilisation of land
.
(5)What are Multipurpose River Valley Projects? Name any two such projects.
List the main ob
multipurpose river valley project.
Answers
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Answer:
UNTREATED SEWAGE FROM HOMES ARE OFTEN DISPOSED OFF INTO RIVERS. RAIN WASHES OFF THE HUMAN EXCRETA AND ANIMAL WASTE NEAR THE WATER SOURCES. MANY INDUSTRIES PRODUCE WASTE MATERIALS WHICH ARE OFTEN DISCHARGED INTO RIVERS. FARMERS USE CHEMICAL FERTILIZERS AND PESTICIDES IN THEIR FIELDS .
Answered by
1
Answer:
Ans 1) If large amounts of fertilizers or farm waste drain into a river the concentration of nitrate and phosphate in the water increases considerably. Algae use these substances to grow and multiply rapidly turning the water green. This massive growth of algae, called eutrophication, leads to pollution
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