7TH STANDARD SCIENCE CHAPTER: 3. ANIMAL FIBRE, KEY POINTS EXPLANATION. LECTURE 16

 7TH STANDARD SCIENCE

CHAPTER: 3. ANIMAL FIBER

KEY POINTS EXPLANATION.

LECTURE 16

THE KEYWORDS AND THE KEY SENTENCES OF EACH AND EVERY CHAPTER MAKES US UNDERSTAND THE LESSON BETTER. SO IF YOU ARE GOING TO LEARN A NEW LESSON, YOU TRY TO FIND THE NEW WORDS AND KEY SENTENCES THAT YOU FEEL. AS FAR AS THIS LESSON IS CONCERN THERE ARE SOME KEYWORDS AND KEY SENTENCES AS FOLLOWING.

KEY POINTS OF ANIMAL FIBER:

1. ANIMAL AND PLANT FIBER IS NATURAL FIBER.

THE FIBER OF ANIMAL IS NATURALLY GROWN ON THE BODY OF THEM AND THE FIBER OF PLANT IS ALSO NATURALLY PRESENT IT.

2. ANIMAL FIBER IS A PROTEIN AND WHILE PLANT FIBER IS A CARBOHYDRATE.

THE NAME OF THE PROTEIN PRESENT IN WOOLEN FIBER IS KERATIN. AND THE NAME OF THE PROTEIN PRESENT IN SILK FIBER IS SERICIN AND FIBROIN AND THE CARBOHYDRATES PRESENT IN THE PLANT FIBER ARE CELLULOSE, HEMICELLULOSE, LIGNIN PECTIN, AND WAX ...ETC.

3. REARING OF SILKWORMS FOR OBTAINING SILK IS CALLED SERICULTURE.

4. STAGES OF THE LIFE CYCLE OF SILKWORMS ARE EGG, LARVAE, PUPA, AND ADULT MOTH.

5. SEPARATION OF SILK FIBER FROM COCOON IS CALLED AS REELING.

6. HAIR OF ANIMALS LIKE GOAT, SHEEP, CAMEL.ETC. ARE USED TO OBTAIN WOOLEN FIBER.

7. A QUALITY WOOL WE GET FROM ANGORA GOAT WHICH IS VERY SOFT.

8. REMOVING OF HAIR OR FLEECE FROM THE SKIN OF THE ANIMAL IS CALLED SHEARING.