Fill in the following blanks with suitable words:

(a) Biomass is another form in which .......... energy manifests itself.

(b) Tidal waves build up and recede .............. a day.

What is the function of anaerobic micro-organisms such as anaerobic bacteria in a biogas plant?

State whether the following statement is true or false:

Tidal energy is one of the forms in which solar energy manifests itself in oceans.

What is biomass? Give three examples of biomass.

Name the biomass which is still widely used as a source of heat energy in many households of country.