Question

The most characteristic feature of spiders is their ability to produce silken threads. Spiders normally have six fingers like silk glands, called spinnerets located beneath their abdomen. To spin a web, the spider squeezes the silk out of its body through two small holes. The liquid silk is thicker than water and dries int 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 elasticity. It can stretch up to 140 percent of its original length. The diameter of these silken threads is about 10,000 of a inch. This silk is used to make webs to trap their prey. The egg sacs of some spiders are also made of silk which penetrates the unborn progeny. Sometimes the spider can also use its silk as a safety feature. A certain species of spider ‘Phidippus apacheanecs’ trails a safety line of fine silk as it jumps. It uses the silk line to recover if it misses its target. The silk of ‘Naphils Spider’ is the strongest natural fibre known.
(b) The spinning of webs are remarkable example of instinctive behaviour. A spider doesn’t have to learn how to make a web, although spinning itself can be adopted 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.
Fill in the blanks:
1. The resistance in the spider silk is due to _________________.
2. The strongest natural fibre is ____________________________.
3. Role of spiders as predators is _____________________________.
4. Find the word from the passage that means intuitive(Para b) ______________.
5. Find the word from the passage that is the opposite of enable (para a)____________

Answer 1

Its ro difficult to find and answer