What is meant by the following terms?
(i) Rearing (ii) Shearing (iii) Sericulture
(i) Rearing: It is the process of taking care of useful animals is known as rearing of animals. These animals produce various useful products for human beings.
(ii) Shearing: The process of removing the fleece or the upper layer of the sheep along with a the hairy fibre is known as shearing. The person who removes the sheep’s hair is called a shearer. Typically each adult sheep is shorn once each year, this process is done generally in summers; this enable the animal's survival without their protective coat of hair.
(iii) Sericulture: The rearing of silkworms for obtaining silk is known as sericulture. Sericulture is the process of cultivating silkworms and extraction of silk from them. Sericulture involves rearing and breeding of sheep. The quality and texture of fibre depends on the breed of the animal.
In the rearing and breeding, process of shearing is done then the sheared skin with hair is washed in tanks to remove the dirt and dust. This process is known as scouring. After scouring, sorting is done. In this, the hairy skin is then sent to the factories where the different textures of hair are separated. Then the fibres can be dyes in various colours and send to the market.
Popular Questions of Class 7 Science
- Q:-
Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food - Q:-
Given below is a crossword puzzle based on this lesson. Use hints to fill in the blank spaces with letters that complete the words.
Down Across
(D) 1 : Thorough washing (A) 1 : Keeps warm
2 : Animal fibre 2 : Its leaves are eaten by silkworms
3 : Long thread like structure 3 : Hatches from egg of moth
- Q:-
Sketch the cross section of soil and label the various layers.
- Q:-
Take three test-tubes. Fill æth of each with water. Label them A, B and C. Keep a snail in test-tube A, a water plant in test-tube B and in C, keep snail and plant both. Which test-tube would have the highest concentration of CO2?
- Q:-
Here is a crossword puzzle: Good luck!
Across
3. Liquid waste products
4. Solid waste extracted in sewage treatment
6. A word related to hygiene
8. Waste matter discharged from human bodyDown
1. Used water
2. A pipe carrying sewage
5. Micro-organisms which causes cholera
7. A chemical to disinfect water - Q:-
Sketch the reproductive parts of a flower.
- Q:-
Solve the following crossword puzzle with the clues given:
Across
2. Plantation prevents it.
5. Use should be banned to avoid soil pollution.
6. Type of soil used for making pottery.
7. Living organism in the soil.Down
1. In desert soil erosion occurs through.
3. Clay and loam are suitable for cereals like.
4. This type of soil can hold very little water.
5. Collective name for layers of soil. - Q:-
Describe how crystals of copper sulphate are prepared.
- Q:-
Match the items in Column I with those in Column II:
Column I Column II
(i) A home for living organisms (a) Large particles
(ii) Upper layer of the soil (b) All kinds of soil
(iii) Sandy soil (c) Dark in colour
(iv) Middle layer of the soil (d) Small particles and packed tight (v) Clayey soil (e) Lesser amount of humus - Q:-
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
Recently Viewed Questions of Class 7 Science
- Q:-
Explain the role of forest in maintaining the balance between oxygen and carbon dioxide in the atmosphere.
- Q:-
Find out the letters of English alphabet or any other language known to you in which the image formed in a plane mirror appears exactly like the letter itself. Discuss your findings.
- Q:-
How do elephant living in the tropical rainforest adapt itself?
- Q:-
Sketch the reproductive parts of a flower.
- Q:-
Classify the changes involved in the following processes as physical or chemical changes:
(a) Photosynthesis
(b) Dissolving sugar in water
(c) Burning of coal
(d) Melting of wax
(e) Beating aluminium to make aluminium foil
(f ) Digestion of food - Q:-
Salma takes 15 minutes from her house to reach her school on a bicycle. If the bicycle has a speed of 2 m/s, calculate the distance between her house and the school.
- Q:-
Why is transport of materials necessary in a plant or in an animal? Explain.
- Q:-
When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain.
- Q:-
Give two examples each of conductors and insulators of heat.
- Q:-
In addition to the rock particles, the soil contains
(i) air and water
(ii) water and plants
(iii) minerals, organic matter, air and water
(iv) water, air and plants
- NCERT Chapter