Science [2 Mark Questions]

Suggest four steps to reduce the use of coal and petroleum.

What are the consequences of loss of forest cover ?

What are trophic levels? Give an example of the food chain and state its various trophic levels.

What contribution can you give to reduce the problem of waste disposal ?

On which functions does the resistance of the conductor depend?

What is a schematic diagram of an electric circuit ? Draw a labelled diagram of an electric circuit comprising a battery, electric bulb, ammeter and plug key (closed). Show the direction of the conventional current.

What are homologous organs? What is significance of homologous organs in the process of evolution ?

What are the changes seen in boys at the time of puberty?

Explain the tendency of metallic property in elements of Group and Period.

State the limitations of Newlands' law of octaves.

Give differences between metallic elements and non-metallic element based on their physical properties.

What is called neutralisation? Give two examples.