Attention Please!
Ques1- How is silk obtained from cocoon?
Ques2- Define the term sericulture.
Ques3- What is 'Rain Water Harvesting'? Elaborate.
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Answers
Answer:
Ans 1 -
(a) silkworm survives only for two or three days
(b) after every sexual contact, female silkworm insulates 300-400 eggs on the leaves of the mulberry tree
(c) In a span of 10 days, each and every egg produces a small female insect called larvae also known as Caterpillar.
(d) Then in approximately 30 to 40 days, growth takes place, larvae become long, sloppy and magnified.
(e) Now continuously for three days this insect spins his head around it and forms the solution of a single long thread which is known as Koya or cocoon or a cocoon is a protective case or shell that the silkworm spins around it.
(f) As soon as it comes in contact with the air, this thread solidifies and a silk thread which is about 1000 meters long is formed. Now, these larvae are converted into a pupa.
(g) In the pupa stage, the larval structures of the silkworm are broken down forming adult structures and the caterpillar gets transformed into a moth.
(h) The cocoon helps the worm to stay protected from the harsh and unfriendly weather conditions.
(i) Usually, the insects spin a cocoon around them at the start of winter and spend the entire season inside the cocoon without the need for food and water. This stage is often referred to as the sleeping stage of the silkworm.
(j) Usually, in 12 to 15 days, Pupa becomes a silkworm (Imago) by transplantation, which, with the help of an alkaline secretion cut the Koya from one side and comes out.
(k) This makes the silk thread of Koya broken into small pieces.
(l) Therefore, to obtain silk, the Koya is put into the boiling water, so that the silkworm which is inside it, died there and segregates thread from it.
(m) In this way, Silk is prepared from Silkworm. And further, this silk is used in the manufacture of clothes, etc.
Ans 2 -
Cultivation of Silkworm is known as sericulture. The mulberry silk moth or Bombyx Mori is used to produce silk by the commercial silk industry.
Ans 3 -
Rain water harvesting is a technique of collection and storage of rainwater into natural reservoirs or tanks, or the infiltration of surface water into subsurface aquifers (before it is lost as surface runoff). One method of rainwater harvesting is rooftop harvesting.
There are three main types of rainwater harvesting system:
1 - direct pumped,
2 - indirect pumped, and
3 - indirect gravity.
In certain situations it may be possible to have a purely gravity system; though such occasions are rare.
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Answer:
Ans1. Extracting raw silk starts by cultivating the silkworms on mulberry leaves. Once the worms start pupating in their cocoons, these are dissolved in boiling water in order for individual long fibres to be extracted and fed into the spinning reel.
Ans2. The process of silk production is known as sericulture.
Ans3.Rainwater harvesting is a type of harvest in which the rain drops are collected and stored for the future use, rather than allowing it to run off.