Why do the terrestrial life forms required fresh water?
(b) Give two examples where fresh water can be found in the frozen form on the Earth.

Give a few examples where water can be recycled and reused to improve the availability of fresh water.

The amount of fresh water of the earth frozen as polar or glacial ice is

What are 'flocs', formed during secondary treatment of sewage ? OR Write any two places where methanogens can be found.

(a) Name the phenomenon which helps fresh water unicellular organisms (e.g., Amoeba) continuosuly gain water in their bodies. Also name the mechanisms by which these organisma throw out exces of water from their bodies. (b) Give at least two examples in plants where similar phenomenon in used to gain water.

Plants like potato, sugarcane do not require seeds for producing new plants. How do they produce new plants? Give two other examples where new plants are produced in the same way.

Why bubbles can be formed using soap water but we do not have bubbles formed out of pure water?