Why do kerosene stoves and bunsen burners have small holes in them?

Why do leaves have stomata?

Why do you lose your sense of taste when you have a cold?

Why do elements in the same group have similar physical and chemical properties?

Why do elements in the same group have similar physical and chemical properties.

Observing the behaviour of different solid fuels. Collect some fuels like candle coal, charcoal, magnesium ribbon, wood, cakes of cow dung, camphor wick of the oil lamp, wick of kerosene stove, domestic gas etc. Burn eac of them one by one with the help of spirit lamp and note the which catch fire slowly ,immediatly?

Do amorphous solids have unit cells in them.

Explain why Water with detergent disolved in it should have small angles of contact.

A water barrel having water upto a depth d is placed on a table of height h. A small hole is made on the wall of barrel at its bottom. If the stream of water coming out of the hole falls on the ground at a horizontal distance R from the barrel, then the value of d is