Olympiad Test: Fibres To Fabrics -2 - Class 7 MCQ

Answer:

The correct answer is A: Pashmina.

Explanation:

• Pashmina: Pashmina shawls are woven from the fur of the Kashmiri goat, which is found in the Himalayan region.


• Parse: Parse is not related to shawls or fur, so it is not the correct answer.


• Kashmiri: Kashmiri refers to something from or related to Kashmir, but it does not specify the type of shawls woven from the fur of a Kashmiri goat.


• Shimla: Shimla is a city in India and is not related to the shawls woven from the fur of a Kashmiri goat.

Therefore, the correct answer is A: Pashmina, as pashmina shawls are specifically woven from the fur of the Kashmiri goat.

Head is swinged from side to side during the formation of cocoon around the caterpillar. 

Answer:
Introduction:
When it comes to the production of woolen cloth, the choice of fibers is crucial. Different types of fibers can be spun and woven to create woolen cloth. In this case, the correct answer is option A, which refers to shorter fibers. Let's dive into the details to understand why.
Explanation:
To create woolen cloth, the fibers used need to have specific characteristics. Wool, which is commonly used for woolen cloth, comes from the fleece of sheep and other animals like goats and alpacas. The fibers obtained from these animals can be spun and woven into woolen cloth. Here's why shorter fibers are suitable for this process:
1. Fiber length: Shorter fibers, also known as staple fibers, are ideal for spinning and weaving into woolen cloth because they have a natural crimp or wave. This crimp allows the fibers to interlock with each other, creating a cohesive fabric.
2. Warmth and insulation: Woolen cloth made from shorter fibers tends to be warm and insulating. The interlocking of the fibers creates air pockets, which trap heat and provide excellent insulation against cold weather.
3. Softness and texture: Shorter fibers often result in a softer and more textured fabric. This is due to the natural crimp and the ability of the fibers to intertwine during the spinning and weaving process.
4. Fluffiness: While fluffy fibers are mentioned in option C, it is important to note that not all woolen cloth is necessarily fluffy. The texture and fluffiness can vary depending on the specific type of wool and the manufacturing process.
Conclusion:
In conclusion, when it comes to spinning and weaving woolen cloth, shorter fibers are the most suitable choice. Their natural crimp, ability to interlock, and resulting warmth and texture make them ideal for creating high-quality woolen fabrics.

The process of taking out threads from the cocoon for use as silk is called as reeling. 

To determine the type of silk that is soft, lustrous, and elastic, we need to analyze the characteristics of each option provided.
A: Kosa silk
- Kosa silk is a type of silk produced by the Antheraea mylitta moth.
- It is known for its coarse texture and dull appearance.
- Therefore, it is not soft, lustrous, and elastic.
B: Mulberry silk moth silk
- Mulberry silk is produced by the Bombyx mori moth.
- It is the most common and widely-used type of silk.
- Mulberry silk is known for its softness, luster, and elasticity.
- Therefore, it matches the given description.
C: Mooga silk
- Mooga silk is produced by the Antheraea assamensis moth.
- It is known for its golden color and durability.
- However, it is not typically described as soft, lustrous, and elastic.
D: Tassar silk
- Tassar silk is produced by various species of wild silk moths, such as Antheraea mylitta and Antheraea paphia.
- It is known for its textured appearance and natural tan color.
- While it is not as soft and lustrous as mulberry silk, it does possess some elasticity.
Based on the given options, the silk fiber that is soft, lustrous, and elastic is Mulberry silk moth silk (Option B).

Lohi bread yield good quality wool. It is found in the states of Rajasthan and Punjab.

Explanation:
The correct reason why you do not get hurt when you get a haircut is that the upper layer of the skin with hair is dead. Here is a detailed explanation:
- When you get a haircut, the hair that is being cut is made up of dead cells. These cells are no longer connected to the blood supply and nerves, so you do not feel pain when they are cut.
- The hair shaft that we see is composed of keratinized cells, which are the result of cell division and differentiation in the hair follicle. These cells are already dead by the time they emerge from the scalp, so cutting them does not cause any pain.
- The hair follicle, which is located beneath the skin, does have sensory cells, but these cells are responsible for detecting sensations such as touch and temperature, not pain. Therefore, cutting the hair does not stimulate these sensory cells to cause pain.
- On the other hand, if you were to cut or damage the skin itself, you would feel pain because the skin is composed of living cells with sensory nerves.
In conclusion, the correct reason why you do not get hurt when you get a haircut is that the upper layer of the skin with hair is dead, and cutting the hair does not stimulate pain receptors.

Sheep Breeds Found Only in Uttar Pradesh and Himachal Pradesh:
There are several breeds of sheep that are found exclusively in Uttar Pradesh and Himachal Pradesh. These include:
Nali:
- Nali is a breed of sheep that is primarily found in the state of Himachal Pradesh.
- It is known for its high-quality wool production and is popular among local farmers for its adaptability to the hilly terrains.
Rampus Bushair:
- Rampus Bushair is another breed of sheep that is native to Himachal Pradesh.
- It is well-suited to the harsh climatic conditions of the region and is primarily reared for meat production.
Lohi:
- Lohi is a breed of sheep that is found in both Uttar Pradesh and Himachal Pradesh.
- It is known for its high milk production and is often reared for both meat and wool.
Bakharwal:
- Bakharwal is a breed of sheep that is found in the hilly areas of Jammu and Kashmir, including parts of Himachal Pradesh.
- It is a hardy breed that is well-adapted to the cold and rugged terrains of the region.
In summary, the sheep breeds found exclusively in Uttar Pradesh and Himachal Pradesh include Nali and Rampus Bushair, while Lohi and Bakharwal are found in these states as well as in other regions.

Answer:
Introduction:
The larvae of silkworm are the early stage of the silkworm life cycle. They undergo several stages of development before transforming into adult moths. These larvae are commonly referred to as caterpillars.
Explanation:
The detailed solution to the question is as follows:
1. Life cycle of silkworm:
- The silkworm undergoes a complete metamorphosis, which means it goes through four distinct stages in its life cycle: egg, larva, pupa, and adult.
- The larval stage is the longest and most crucial phase in the life cycle of a silkworm.
2. Identification of the larvae:
- The larvae of silkworm are commonly known as caterpillars.
- Caterpillars are characterized by their elongated bodies, segmented appearance, and numerous legs.
- They have soft, cylindrical bodies covered in tiny bristles.
3. Importance of larvae in silk production:
- The larvae/caterpillars of silkworms are of great economic importance in silk production.
- They feed on mulberry leaves and continuously grow, shedding their skin several times during their larval stage.
- The silkworm larvae produce silk fibers from special glands in their bodies, which they use to spin cocoons.
Summary:
In conclusion, the larvae of silkworm are commonly known as caterpillars. They play a vital role in silk production by feeding on mulberry leaves and producing silk fibers from their bodies. The caterpillar stage is a crucial phase in the life cycle of a silkworm before it transforms into an adult moth.