Describe the phenomenon electrolysis with the help of two examples.

Explain chemical energy with the help of two examples.

Explain mutualism with the help of an example.

(a) Describe the events of Oogenesis with the help of schematic representation. (b) Write two differences between Oogenesis and Spermatogenesis.

Explain commensalism, with the help of an example.

(a) Describe the events of spermatogenesis with the help of a schematic representation. (b) Write two differences between spermatogenesis and oogenesis.

Describe the process of filtration with the help of a well-labelled diagram.

Differentiate between suspension and emulsion with the help of examples.

Explain exothermic reactions with the help of examples.

Describe an inclined plane and a screw with the help of examples where they are used in daily life.

Explain brood parasitism with the help of an example.