1. The process of obtaining silk fibre from cocoons is called
2. Silk worm is a
3. The vessels that transport water and minerals are called
4. Which chamber of heart receives oxygenated blood from heart? icle
5. The water holding capacity is the highest in:
1. Describe the life cycle of a silkworm with diagram.
2. What is carding? Why is it necessary?
3. List the differences between clayey soil and sandy soil.
4. It is good practice to remove grass and small plants that are growing in an open, unused field? Give reason to support your answer.
5. Differentiate between transport of substances through xylem and phloem.
6. Differentiate between arteries and veins.
7. Describe the structure of the human heart with a diagram?
Answers
1. The process of obtaining silk fibre from cocoons is called
The process of taking out the fibres
from the cocoons is called reeling. Reeling is done by machines. The silk fibres are then spun into threads and woven into silk cloth.
2. Silk worm is a
Bombyx mori, the domestic silk moth, is an insect from the moth family Bombycidae. It is the closest relative of Bombyx mandarina, the wild silk moth. The silkworm is the larva or caterpillar of a silk moth. It is an economically important insect, being a primary producer of silk.
3. The vessels that transport water and minerals are called
xylem, plant vascular tissue that conveys water and dissolved minerals from the roots to the rest of the plant and also provides physical support. Xylem tissue consists of a variety of specialized, water-conducting cells known as tracheary elements.
4. Which chamber of heart receives oxygenated blood from heart? icle
The heart consists of four chambers in which blood flows. Blood enters the right atrium and passes through the right ventricle. The right ventricle pumps the blood to the lungs where it becomes oxygenated. The oxygenated blood is brought back to the heart by the pulmonary veins which enter the left atrium.
5. The water holding capacity is the highest in:
The water holding capacity of a soil is a very important agronomic characteristic.The water holding capacity is highest in clayey soil because it is made up of very small tightly packed particles that do not allow water to percolate.Hence The water holding capacity is the highest in Clayey soil.
1. Describe the life cycle of a silkworm with diagram.
Life cycle of a silkworm can be primarily divided into 4 stages-namely the egg (ovum), larva, pupa, and adult (moth). The number of days required for each stage is 10 to 14 days for the egg, 20 to 25 days for the larva, 10 to 14 days for the pupa, 7 days for the adult and 50 to 60 days for 1 cycle.
2. What is carding? Why is it necessary?
Carding is a mechanical process that disentangles, cleans and intermixes fibres to produce a continuous web or sliver suitable for subsequent processing. It breaks up locks and unorganised clumps of fibre and then aligns the individual fibres to be parallel with each other.
3. List the differences between clayey soil and sandy soil.
Clayey soil - Contains finer particles, Particles are tightly packed, It is fertile, High water retention capacity, Lowest percolation rate of water, Good for growing various crops, Less air is trapped between the particles.
Sandy soil - Contains larger particles, Particles are, loosely packed, It is not fertile, Low water retention capacity, Highest percolation of water, Not suitable for growing crops, More air is trapped between the particles.
4. It is good practice to remove grass and small plants that are growing in an open, unused field? Give reason to support your answer.
No, because the soil surface is covered by plants. Their roots connect the soil particles and hold them in place.During strong winds and rains they prevent soil erosion and thereby protect the topsoil.
5. Differentiate between transport of substances through xylem and phloem.
Xylem is a conducting tissue that is responsible for the transport of water while phloem is a conducting tissue that is responsible for the transport of food in plants. Xylem transports soluble minerals and water molecules. Phloem transports food and other nutrients like sugar and amino acids.
6. Differentiate between arteries and veins.
Arteries and veins (also called blood vessels) are tubes of muscle that your blood flows through. Arteries carry blood away from the heart to the rest of the body. Veins push blood back to your heart. You have a complex system of connecting veins and arteries throughout your body.
7. Describe the structure of the human heart with a diagram?
The heart wall is made up of three layers: The outer layer of the heart wall is called epicardium. The middle layer of the heart wall is called myocardium. The inner layer of the heart wall is called endocardium.
Explaination:
I hope it will help you
Drop some thanks
And foll ow me pls
Thank you :)