Science 1 Marks Question

The stage next to caterpillar in the life cycle of silk moth is called pupa.

In humid weather, people tend to sweat more. Cotton fabric being a good absorber absorbs sweat faster than any other fabric and hence keeps people comfortable.

The air captured between two thick cotton sheets is much more than in a single blanket. Therefore, there is more insulation in cotton sheets and thus they are warmer.

A fibre is a long strong thread, which is obtained from natural sources like plants or manmade sources like synthetic fibres, e.g: Rayon.

Silk.

Carding is a process in which ‘carding’ machine combs the loose wool fibres into a sheet.

Light colours are poor absorbers of heat. So, in summers they keep us cool.

The rearing breeding and management of silkworms for obtaining silk is called sericulture.

The thick coat of hair on their body traps a lot of air. Air is a poor conductor of heat, thus, hair keeps sheep warm.

In Tibet and Ladakh, angora goats are found.

Wool yielding animals bear fleece (hair) on their body.

False.
Sheep are mostly reared for wool in India.

Liama and alpaca are found in South America.

Caterpillar in its later stage of development completely covers itself by silk fibres and turns into pupa. This covering is known as cocoon.

Rampur bushair and Bakharwal are the breeds of sheep.

Mulberry silk moth.

The process of removing seed from cotton called ginning.

Hair trap a lot of Air, which is a poor conductor of heat.

Llama and Alpaca.

The fleece of sheep is the main source of wool .Apart from that, Angora wool is obtained from angora goats. The fur (hair) on the body of camels is also used as wool like Llama and Alpaca.

The process of breeding of selective parents for obtaining special characters in their offspring such as soft under hair in sheep, is termed as selective breeding.

The steps in silk production include gathering of cocoons, killing of moths inside them, taking out of threads, i.e., reeling and spinning the fibre into yarn, i.e., throwing.

Wool of Angora goat.

The covering of silk fibres inside which the caterpillar covers itself is called cocoon.

The first step is shearing then scouring.

Hilly region like Jammu and Kashmir.

Yarn is a long continuous thread that is made up of fibre.

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

These animals are yak, camel and sheep.

Artificial silk is a plant fibre.

Sheep are herbivores, and prefer grass and leaves of various trees. Their food also contain a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals.

False. Explanation: Wool can be made from sheep, yak, llama, camel, alpaca and goats.

Scouring.

The maximum length of continuous silk thread that can be obtained from a cocoon is more than that of 1000 feet (1000 to 1500 feet) continuous in length.

Kashmiri goats.

Yak wool is common in the hilly regions of Ladakh.

Sericulture and moriculture.

Mulberry silk, tassar silk, eri silk, Mooga silk etc.

China.

No.

Lohi, Rampur, bushair, Nali, Bakharwal, Marwari and Patanwadi.

The correct sequence is: Shearing → Scouring → Sorting → Picking out the burrs → Dyeing in various colours.

The process of making yarn from fibres is called spinning.

The sheared skin with hair is thoroughly washed in tanks to remove grease, dust and dirt. This process is known as scouring.

Mooga.

Shearing does not hurt the sheep because the uppermost layer of the skin is dead. Also, the hair of sheep grows again just as our hair does.

Silk and wool are two fibres which are made up of proteins.

Weaving is the process of arranging two sets of yarns together to make a fabric.

The sources of obtaining fibres are plants and animals.

Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel.

The main aim to rear the sheep is to obtain wool.

Workers in wool industry get infected by a bacterium, anthrax, which causes a fatal blood disease called sorter's disease.

During shearing the uppermost layer of sheep’s skin which is dead is removed. Therefore, it does not hurt the sheep.

We wear clothes according to the climate. In summers we wear clothes that keep us cool and in winters we wear clothes which keep us warm.

Usually shearing of wool is done only in summer as sheep do not to survive without their protective coat of hair in winter.

The process of removing the fleece of the sheep along with a thin layer of skin is from its body is called shearing. It is done by using shearing machine.

Wool is obtained from the fleece or hair of sheep.

A thick coat of hair helps in trapping a lot of air. As, air is a poor conductor of heat, it keep these animals warm.

Silkworm.

Caterpillars should not be collected with bare hands because skin of caterpillars may cause allergy.

Silk fibres come from cocoon of silk worm.

False.
Wool can be made from sheep, yak, llama, camel, alpaca and goats.

Wool is the soft, curly fibres obtained from the fleece of sheep, goat and yak etc., it clothes made from wool keeps us warm.

People working in the wool industry sometimes get infected by a bacterium called anthrax, during the sorting (separating) the fleece of sheep into fibres of different qualities. It leads to a fatal blood disease called sorter’s disease.

Silk and Wool fibres are obtained from animals.

White fleece means the hairy skin which is white in colour.

Sheep, goat yak etc.

The hairy skin called fleece have wool in black sheep.

Wool, silk.

Cotton clothes are thin and do not have spaces in their fabrics through which air can be trapped, to keep us warm thus Cotton clothes do not prevents heat coming out of our body.

Poor.

Keratin is the chief component of wool fibres.

True.

Selective breeding is defined as the breeding of plants and animals to obtain desirable characteristics.

The sheep's hair are Sheared off from its body, scoured, sorted, dried, dyed, spun and woven to yield wool.

Hair trap a lot of air, which is a poor conductor of heat.

The larva (or caterpillar) of a silk moth makes the silk fibre.

The sheared hair is cleaned and washed in tanks to remove grease, dust and dirt. This is called scouring.

Protein.