Question

Read the information about Kolleru lake in the given table and answer the following questions.

Classes	Area in 1967 (Km2)	Area In 2004 (Km2)
Lake-water spread area	70.70	62.65
Lake with sparse weed	0	47.45
Lake with dense weed	0	15.20
Lake-liable to flood in rainy season	100.97	0
Aquaculture ponds	0	99.74
Rice fields	8.40	16.62
Encroachment	0.31	1.37
Total	180.38	180.38

a) In which year, lake water spread area is more? 

b) Why do you think weeds are more in the lake? 

c) Guess the reasons for decrease in the lake area. 

d) What measures are to be taken to control pollution in the lake?

Answer 1

a) In the year 1967 

b) Addition of excessive nutrients from aquaculture ponds and rice fields. 

c) Aquaculture ponds, Ricefields and Encroachment are the reasons for decrease in lake area. 

d) Anthropogenic activities are to be controlled in the lake catchment area. 

(Or) 

Fish ponds are to be removed in the lake catchment area. 

(Or)

Agricultural practices in the lake area should be minimised as per the norms of government.