C. Very short answer type questions :
1. What is the process by which wheat is separated from husk & straw known as?
2. What does burning of a candle wax releases?
3. Name two food items which contains carbohydrates.
4. From which animal is silk obtained?
Answers
1) Separating remaining loose chaff from the grain is called winnowing – traditionally done by repeatedly tossing the grain up into a light wind which gradually blows the lighter chaff away.
2) When you light a candle, the heat of the flame melts the wax near the wick. This liquid wax is then drawn up the wick by capillary action. The heat of the flame vaporizes the liquid wax (turns it into a hot gas), and starts to break down the hydrocarbons into molecules of hydrogen and carbon.
3) Breads, grains, and pasta.
4) The protein fiber of silk is composed mainly of fibroin and is produced by certain insect larvae to form cocoons. The best-known silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyx mori reared in captivity (sericulture).