Q. Give scientific reasons for the following facts:
1) We gargle with saline solution in case of throat infection.
2) The resins swell up in water.
3) The grass in your lawn becomes greener if you add a little fertilizer to it but it dies if you add a lot of it.
4) When we open a perfume bottle in one corner of a room we feel the smell everywhere in the room.
5) Salt and sugars are used for preserving food.
6) Soft skinned grapes may shrink if kept in a very strong sugar solution.
7) Freshwater fish cannot survive in sea water.
8) A closed can of dried seeds bursts open if some water enters it by accident.
9) Bacteria and fungi do not grow in pickles,jams, jellies and squashes.