Question 21 MarkSilk is obtained from which of the four stages ?Answerlarva (called caterpillar or silkwormView full question & answer→
Question 31 MarkName the vitamins obtained from liver oil of fish.AnswerLiver oil of fish is a rich source of vitamin A, D and E.View full question & answer→
Question 41 MarkName three plant fibres.AnswerCotton [obtained from the seed hair of Gossypium (cotton plant)]Jute [obtained from the stem of Corchorus (jute plant)]Flax [obtained from the stem of Linum\.View full question & answer→
Question 51 MarkWhat is piggery ?AnswerThe rearing and mangaement of pigs is called piggery.View full question & answer→
Question 61 MarkWhat are antibiotics ?AnswerAntibiotics are chemical substances derived from fungi, bacteria and other organisms, that inhibit the growth and destroy microorganisms causing infections. Example – penicillin is an antibiotic obtained from fungus Penicillium.View full question & answer→