Answer: Option B. -> False
:
B
Actually, silkworms are not worms, but the larvae or caterpillars hatched from the eggs of the silk moth.
The silk moth passes through the larva and pupa stages during its development after hatching from the egg and forms an adult silk moth.

:
Selective breeding is a process of selecting the parents for obtaining special characters in the offspring.Selective breeding is done to have sheep with soft hair.

:
Order of processing 1 Mark
Definition and explaination: 2 Marks
The order is as follows:
Fibres, Yarn, Fabric.
Fibre: Athread or filament from which a vegetable tissue, mineral substance, or textile is formed.
Yarn: Yarnis a long continuous length of interlocked fibressuitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, and ropemaking.
Fabric: Cloth produced by weaving or knitting textile fibres.

:
Explanation of each process: 1.5 Marks
For the conversion of yarn to fabric, the two main processes used are weaving and knitting.
Weaving:
Weaving is the process of arranging two sets of yarns together perpendicular to each other to make a fabric.Fabrics are woven on looms. These looms may be operated by power or by hand.
Knitting:
Knitting is a process that makes use of a single yarn to make a piece of fabric.While knitting, a single yarn is used to make a piece of fabric.
Knitting can be done by hand or on machines.

:
Each point: 1 Mark
(a) False, Yak hair is used to make woolen fabric.
(b) True.In the process of obtaining wool from fleece, sorting is done after scouring.
(c)False, The rearing of silkworms for obtaining silk is called sericulture.
(d)False, generally sheep are rearedfor obtaining wool.
(e)True,Silkworms are caterpillars of the silk moth.

:
Definition: 1 Mark
Explanation: 1 Mark
Bioclip is a chemical method of shearing.
In bio-clip, a protein derivedchemical is injected into sheep which makes the sheep lose its fleece. Whereas in shearing, the fleece is shaved manually.

Answer: Option C. -> shearing
:
C
$\bullet$ Shearing is the first step involved in the processing of wool. In this process, fleece of the sheep is removed along with a thin layer of its skin.
$\bullet$ Sheared skin of the sheep is washed to remove grease, dirt and dust. This process is called scouring.
$\bullet$ The scoured wool is then sorted intocoarse and soft wool, by the process of sorting.
$\bullet$ The sorted wool fibres are then dyed in different colours, before the yarn is made. This process is called dyeing.

Answer: Option C. -> scouring
:
C
Scouring is the process of washing the sheared hair. The woolen fibres are thoroughly washed in big tanks to remove grease, dust, and dirt manually or by machines.

Answer: Option D. -> Silk
:
D
Silk is the natural fibre obtained from the cocoons of the silkworms. All of the other given options: Nylon, Dacron and Acrylic are man-made fibres.

Answer: Option A. -> True
:
A
After the larvae of silkmoths feed on the mulberry leaves and grow in size, they secrete a kind of fibrous protein which hardens around it like an enclosure. This silk fibre covering over silkworm is known as cocoon.