What is the nature of the image formed by a concave lens? Can this be taken on the screen.

Following are the steps involved in the experiment ‘to determine the percentage of water absorbed by raisins’. They are not in proper sequence.

I. Soak the raisins in fresh water.

II. Weigh dry raisins.

III. Weigh soaked raisins.

IV. Wipe out soaked raisins.

The proper sequence of step is

When we open a dicotyledon seed, then its embryo shows two parts. Name these two parts and write their functions.

A compound ‘X’ in its aqueous solution form, is added to acetic acid taken in a test tube. Then a gas is evolved. This gas turns lime water milky. Name the compound ‘X’ and the gas evolved. Also write the equation for the reaction.

Why it is necessary to conserve our environment?