Question

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 cover?(b) What damages does it cause to the ecology?

Answer 1

The new fuel cell could be a cheaper, more practical way to generate energy to heat homes and eventually run cars .