Explain the reactions of water with metals with the help of examples.

Explain mutualism with the help of an example.

Explain the meaning of derived unit with the help of one example.

Explain exothermic reactions with the help of examples.

Describe the action of alkalis on metals with the help of reactions.

Explain commensalism, with the help of an example.

Explain brood parasitism with the help of an example.

(i) Why are grasshopper and Drosophila said to show male heterogamity ? Explain. (ii) Explain female heterogamity with the help of an example.

(i) Why are grasshopper and Drosophila said to show male heterogamity ? Explain. (ii) Explain female heterogamity with the help of an example.

Write the reactions of any three metal oxides with water.

Thermodynamic feasibility of the reaction alone cannot decide the rate of the reaction. Explain with the help of one example.