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.
causes alga to grow so rapidly in water bodies?
d) Explain how eutrophication impacts aquatic animals.
Answers
Answer:
The least that a city with 11-million population and an economy valued at $44.3 billion (approximate gross domestic product) could do is be water-secure.
Bengaluru, lately, has been staring at doomsday predictions with regard to its depleting water sources and its frothing, burning lakes. A BBC report, earlier this month, claimed that the IT city would follow South Africa’s Cape Town and soon run out of drinking water. A more recent assessment by Down To Earth, a publication of the Centre for Science and Environment (CSE), echoed that the number of water bodies in the city has reduced by 79% in the past four decades due to unplanned urbanisation and encroachment. Simultaneously, builtup area has increased from 8% in 1973 to 77% presently.
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Explanation: