5. The following data shows the number of water bodies in Bengaluru city from 1973
to 2007. Observe the data and answer the following questions: (4*1 = 4 marks)
51
SO
38
40
30
25
17
20
10
1973
1992
2002
2007
Number of water bodies
Source: Indian Institute of Science
a) Explain the trend in the number of water bodies from 1973 to 2007.
b) What could be the possible reason behind this trend?
c) Many water bodies in cities like Bengaluru are eutrophied due to algal growth. What
causes alga to grow so rapidly in water bodies?
d) Explain how eutrophication impacts aquatic animals.
Answers
Answer:
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Page No 276:
Question 1:
The marks of a student in different subjects are given below:
Subject Hindi English Maths Science Social science
Marks 43 56 80 65 50