Question

1. difference between silk and wool fibres.
2. what is selective breeding and when do you prefer selective breeding?
3. mention the place and the type of wool that is obtained from the following breeds of sheep .
☆targhee
☆nali
☆lohi
☆Barbado

4. describe the stages involved in the life cycle of a silkworm with a diagram.
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!!Correct answers needed!!

-by @Unic0rnXila​

Answer 1

Answer:

Both silk and wool are natural fibers obtained from animals. Silk from silkworm cocoons and wool from furry animals like goats. They both keep warm and are used in silk bed sheets and silk sleepwear.

...

Differences Between Silk and Wool.

Silk Wool

Origin Silk is produced from cocoons of silkworms. Wool is produced from fur of animals.

Explanation:

First

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Answer 2

Question:-

1). Differentiate between silk and wool fibres.

Answer:-

$\boxed{\rm{\red{Silk \longrightarrow }}}$

• It is lustrous and soft.

• It is a bad conductor of heat.

• It is very elastic, thus resists creasing.

• It is as strong as a steel wire of the same diameter.

• It has a peculiar natural shine and dyes well.

• It is resistant to dust.

$\boxed{\rm{\red{Wool \longrightarrow }}}$

• It appears mostly creamy white in colour.

• It does not wrinkle easy.

• It is a durable and elastic.

• It is a bad conductor of heat.

• It absorbs moisture to a great extent.

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Question:-

2). what is selective breeding and when do you prefer selective breeding?

Answer:-

• $\sf\green{↬}$ The process of selecting parents for obtaining desirable characters in their offsprings is known as $\sf\blue{selective \ breeding}$. The bred animals are called as $\sf\blue{breeds}$.

• $\sf\green{↬}$ To improve the production and quality of wool, some sheep are selectively bred with other sheep. The desirable characters that can be taken into consideration while selecting the breeds are resistance to diseases, tolerance to environmental conditions, appearance of wool fibre and wool type.

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Question:-

3).Mention the place and the type of wool that is obtained from the following breeds of sheep .

◉targhee

◉nali

◉lohi

◉Barbado

Answer:-

$\boxed{\rm{\pink{★targhee★ \longrightarrow }}}$

$\sf\green{quality \ of \ wool}$

• Find and long wool

$\sf\orange{Name \ of \ the \ place \ where \ it \ is \ found}$

• United States

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$\boxed{\rm{\pink{★Nali★ \longrightarrow }}}$

$\sf\green{quality \ of \ wool}$

• Carpet wool

$\sf\orange{Name \ of \ the \ place \ where \ it \ is \ found}$

• Rajasthan, punjab, Haryana

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$\boxed{\rm{\pink{★Lohi★ \longrightarrow }}}$

$\sf\green{quality \ of \ wool}$

• Good quality of wool

$\sf\orange{Name \ of \ the \ place \ where \ it \ is \ found}$

• Rajasthan, punjab

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$\boxed{\rm{\pink{★Barbado★ \longrightarrow }}}$

$\sf\green{quality \ of \ wool}$

• Short, coarse wool

$\sf\orange{Name \ of \ the \ place \ where \ it \ is \ found}$

• Texas

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Question:-

4). describe the stages involved in the life cycle of a silkworm with a diagram.

Answer:-

• Laying of eggs

• Hatching into caterpillars

• Formation of cocoon.

• Emergence of a silk moth.

Diagram:-

• Refer to the attachment for the diagram of $\sf\green{life \ cycle \ of \ a \ silk \ moth}$.

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Additional information:-

$\boxed{\rm{\red{Wool \longrightarrow }}}$

• $\sf\pink{↬}$Wool is an animal fibre obtained mainly from the fleece of some animals. Wool fibres trap air in the spaces between them. As air is a bad conductor of heat, this prevents the loss of heat from the body, which helps keeping the body of these animals warm.

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$\boxed{\rm{\red{Silk \longrightarrow }}}$

• $\sf\pink{↬}$It is an animal fibre obtained from silkworms. Silkworms are the larvae or caterpillars of silk moths. There are many species of silk moths but the most widespread silk is obtained from the silk moth bombyx mori.

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