Question

- From which plant part, cotton fibres are obtained.
A.Root hairs
B.Stem hairs
C.Leaf
D.Seed coat

Answer 1

Cotton is soft, fluffy, white or yellow coloured fibres which are obtained from the plants of the family Malvaceae which is having genus Gossypium. It is grown and obtained worldwide to use in a variety of industries. Cotton has a lot of commercial value, one of the most important uses in the clothes industry.

Complete answer:
Option -A- Root hairs
This option is incorrect as root hairs are the modifications of some of the plants. It is a modification of roots. It is as such has less importance for commercial use and has importance for plants only increased surface area for the absorption of more water and essential nutrients from the soil.
Option -B- Stem hairs
The stem hairs have much importance in some plants and algae. They have a diversity of their function. They decrease the area for evaporation from the aerial parts of the plants and also in some plants it reduces heat dispersion. So this option is also incorrect.
Option -C- Leaf
The leaves on the cotton plant are simple and they have a great variation of leaves depending on the species. Large leaves are arranged in an alternate order and found arranged along the stem in a spiral manner. But cotton is not obtained from leaves and so this is an incorrect option.
Option -D- Seed coat
As such cotton is a soft and fluffy fibre which has a great staple length that grows in the form of large bolls around the seed coat. The cotton is found to grow on around the seed coat of the plants Gossypium. Cotton fibres are found growing in the seeds of these plants around the seed coat.

Hence the correct answer is OPTION(D)

Note: The cotton plant is classified as such a shrub and it is found to be the native plant of many tropical and subtropical regions. It is found to grow in both old and new worlds. The cotton obtained from cotton plants is yarn into fibres which is used in many industries.