Do you know the period from which wild animals were being tamed?

Do you know why corrosion occurs?

Do you know what 'soap' is?

How do you know the percolation rate of soil?

Do you know what is a catalyst ?

Do you know to catch fish in pond?

Do you know we get water from fruits and vegetables also ?

What physical feature pertaining to the organism and its medium do you notice in a sponge body form which sponges can be/were identified as animals and not plants ? What do you call the region in the sponge body in which you noticed that feature ?

Do you know how old electric calling bells works?

What do you mean by representative elements? Name the groups of the periodic table, which contain representative elements.

Do you know which part of the plant gives rise to fruit ?