CBSE Class 7 English Important Worksheet (5). Students can download these worksheets and practice them. This will help them to get better marks in examinations. Also refer to other worksheets for the same chapter and other subjects too. Use them for better understanding of the subjects.
Read the given passage and answer the questions that follow:
Fleas are perfectly designed by nature to feast on anything containing blood. Like a shark in the water or
a wolf in the woods, fleas are ideally equipped to do what they do, making them very difficult to defeat.
The bodies of these tiny parasites are extremely hardy and well-suited for their job.
A flea has a very hard exoskeleton, which means the body is covered by a tough, tile-like plate called a
sclerite. Because of these plates, fleas are almost impossible to squish. The exoskeletons of fleas are also
waterproof and shock resistant, and therefore fleas are highly resistant to the sprays and chemicals used
to kill them.
Little spines are attached to this plate. The spines lie flat against the flea’s thin, narrow body as the flea
scurries through an animal’s fur in search of food. However, if anything (like fingers or a self-grooming
pet) tries to pull a flea off through the hair coat, these spines will extend and stick to the fur like Velcro.
Fleas are some of the best jumpers in the natural world. A flea can jump seven inches, or 150 times its
own length, either vertically or horizontally. An equivalent jump for a person would be 555 feet, the
height of the Washington Monument. Fleas can jump 30,000 times in a row without stopping, and they
are able to accelerate through the air at an incredibly high rate—a rate which is over ten times what
humans can withstand in an airplane.
Fleas have very long rear legs with huge thigh muscles and multiple joints. When they get ready to jump,
they fold their long legs up and crouch like a runner on a starting block. Several of their joints contain a
protein called resilin, which helps catapult fleas into the air as they jump, similar to the way a rubber
band provides momentum to a slingshot. Outward facing claws on the bottom of their legs grip anything
they touch when they land.
The adult female flea mates after her first blood meal and begins producing eggs in just 1 to 2 days. One
flea can lay up to 50 eggs in one day and over 2,000 in her lifetime. Flea eggs can be seen with the naked
eye, but they are about the size of a grain of salt. Shortly after being laid, the eggs begin to transform
into cocoons. In the cocoon state, fleas are fully developed adults, and will hatch immediately if
conditions are favorable. Fleas can detect warmth, movement, and carbon dioxide in exhaled breath,
and these three factors stimulate them to emerge as new adults. If the flea does not detect appropriate
conditions, it can remain dormant in the cocoon state for extended periods. Under ideal conditions, the
entire life cycle may only take 3 weeks, so in no time at all, pets and homes can become infested.
Because of these characteristics, fleas are intimidating opponents. The best way to control fleas,
therefore, is to take steps to prevent an infestation from ever occurring.
Q1) What is sclerite? How is it useful for the fleas?
Q2) Describe how fleas are the best jumpers in the natural world.
Q3) What are the favourable factors required by a cocoon of flea to transform into a developed adultflea?
Q4) Choose the correct option:
A) The primary purpose of the passage is to
a. educate the reader about the physical characteristics of fleas
b. compare fleas to other members of the animal kingdom
c. relate the problems that can result from a flea infestation
d. explain why a flea infestation is hard to get rid of
B) The author’s tone in the passage is best described as
C) According to the passage, fleas are resistant to sprays and chemicals because they
a. have waterproof sclerites
b. are excellent jumpers
c. reproduce very rapidly
d. can stick to fur like Velcro
D) According to the passage, which of the following statements is true?
i. Fleas extend their little spines if threatened.
ii. Fleas have the ability to jump higher than humans.
iii. Humans can jump higher if they consume foods containing resilin.
iv. The resilin found in fleas helps catapult fleas into the air as they jump
a) Only (i) is true
b) All the above statements are true
c) Both (i) and (ii) are true
d) None of the above statements is true
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