Page 2 - CBW

6. Assertion (A): Jute plants are harvested at the flowering stage.
Reason (R): Harvesting at this stage ensures the best quality fibre.

7. Assertion (A): Silk is a natural fibre obtained from silkworms.
Reason (R): Silkworms spin a protective covering around themselves called a cocoon, from
which silk threads are extracted.

8. a) Identify the type of fibre used for making the
fabric illustrated in the picture.

b) We prefer to wear clothes made of this fibre
in winter. Why is wool considered as a good
insulator?

9. Cotton is a natural fibre obtained from the cotton plant. The process of transforming cotton
into fabric involves several steps. Initially, cotton bolls, which are the fruit of the cotton plant,
are harvested. These bolls burst open when mature, revealing the cotton fibres. The
harvested cotton is then subjected to a process called ginning, where the fibres are separated
from the seeds. After ginning, the fibres are spun into yarn through a process known as
spinning. This yarn is then woven or knitted to produce fabric. The fabric may undergo
additional treatments like dyeing and finishing to enhance its appearance and texture.

Questions:
a) What is the first step in the process of making fabric from cotton?
b) What happens during the spinning process?
c) How is fabric made from yarn?

10. With the advent of synthetic fibres, the textile
industry saw a significant shift. Fibres like nylon,
polyester, and acrylic are produced from chemical
substances. These fibres are durable, resistant to
wrinkles, and easy to maintain, making them
popular choices for everyday clothing.

Questions:
a) Differentiate between natural and
synthetic fibres.
b) List the advantages of using synthetic fibres in clothing.