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Q 1913480349.     Ravi was very excited to visit Kolkata after 5
years. It was his hometown for so many years.
On his way to his house from the airport he saw
all the small ponds were covered with some green
weed forming a carpet.
(a) What could be the reason for this green
(b) What damages does it cause to the
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)