Some animals have a thick coat of hair on their body. These hair give a material X which is used for making cardigans after suitable treatment. The material X traps a lot of Y which prevents the body heat of these animals from being lost to surroundings and keeps them warm in winter. The material X is removed from the animals at the beginning of the season Z. 
(a) What are (i) X, and (ii) Y? 
(b) Name the season Z.
(c) Name any four animals which yield X. 

The hair of an animal $\mathrm{A}$ are cut from its body in one piece along-with a thin layer of its skin in the form of $\mathrm{B}$. This process is called $\mathrm{C}$. The $\mathrm{B}$ of this animal is then cleaned by using soap and a lot of water by a process $\mathrm{D}$. The clean $\mathrm{B}$ is then converted into yarn $\mathrm{E}$ by the process of sorting, dyeing, combing and spinning. 

(a) What could be (i) $\mathrm{A}$ and (ii) $\mathrm{B}$? 
(b) Name the process (i) $\mathrm{C}$ and (ii) $\mathrm{D}$. 
(c) What is the yarn $\mathrm{E}$? 
(d) State one use of $\mathrm{E}$. 

$\mathrm{A}$ is an insect which looks like a butterfly. $\mathrm{A}$ is not formed as such from its eggs directly. The hatching of eggs produces a stage called $\mathrm{B}$ or $\mathrm{C}$, and then an encased form $\mathrm{D}$ which ultimately forms insect $\mathrm{A}$. The worm-like stage $\mathrm{B}$ or $\mathrm{C}$ is also known by a yet another name $\mathrm{E}$. The stage E is important because it leads to the formation of an important fibre $\mathrm{F}$. 

(a) Name the insect $\mathrm{A}$. 
(b) What are stages (i) $\mathrm{B}$ (ii) $\mathrm{C}$ (iii) $\mathrm{D}$, and (iv) $\mathrm{E}$ known as? 
(c) Name the fibre $\mathrm{F}$. 
(d) Name the tree on whose leaves $\mathrm{E}$ feed.