Question

The most characteristte feature of spiders in their ability to produce sitten
threads Spiders normally have six finger like silk alands, called 'spinnerets'
located beneath their abdomen. To spin a weh, the spider squeexes the sille out
ofits body through two small holes. The liquid silk is thicker than water and dries
into a fine thread as soon as it comes in contact with air. Spider silk is much
stronger than steel and resists breakage because of its elastiety. It can stretchup
to 140 per cent of its original length. The diameter of these silken threads is about
10.000 of an inch, Spiders use this silk to make webs to trap their prey. The egg
sacs of some spiders are also made of sille whieh pretreats the unborn pregeny,
Sometimes the spider can also use its sille as a safety feature. A certain species of
spider 'phidippus apacheanecs' trails a safety line of fine sille as it jumps. It uses
the silk line to recover if it misses its target. The sille of 'Naphils Spider' is the
strongest natural fibre known,
The spinning of webs is a remarkable example of instinctive behaviour, A
spider does not have to learn how to make a web, although spinning itself can be
adapted to unique circumstances. For example, 'orb' webs are circular in shape
and take an hour to build, Funnel spiders spin a net-like entrance to their homes,
which helps to trap food. Similarly, trap door spiders dig their homes and spin a
trap door out of their silk for trapping insects. As integral components of our
biosphere, spiders have an intrinsic existence value. They are efficient predators
that play an important role in controlling the pests of cotton. They are also a
source of food for other creatures, such as birds and wasps. Thus, the presence of
spiders is an ecological indicator signalling the health of natural ecosystem,
Q. Answer the following questions: [06]
1. What is so special about spiders?
2. How does spider silk resists breakage?
3. Write one feature of spider silk.
4. Why are egg sacs made of silk?
5. How does spider get its prey?
6. Does spider learn to make its web?​

Answer 1

Answer:

ANSWER

Dadhich Colony

Mathura road

Beawar

17 April 2016

collector

Beawar district Ajmer

Subject complain for irregular supply of electricity

Sir

By this letter I want to bring your attention in the matter that our examinations are near and the supply of electricity in our town is not proper somany times we asked to electricity department but they do not take any action so here we request to you for take action as soon as possible.

Yours Faithfully

Citizen of Beawar