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Silkworms live for only two or three days after laying eggs. About 36,000 to 50,000 eggs are laid, and these are carefully stored at the silkworm farm until they are ready to hatch. The eggs hatch into caterpillars, which feed on mulberry leaves. Soon, the caterpillars are ready to spin their cocoons. Not all caterpillars can spin silk cocoons. Only the caterpillars of a silkworm moth known as ‘Bombyx mari’ can do such spinning. This caterpillar has special glands which secrete liquid silk through its lower lip. The liquid produced later hardens to form tine strands.
The caterpillar makes its cocoons using these strands. The threads on the outside of the cocoon are rough, while those inside are soft and smooth.
Some fully-spun cocoons are heated. This kills the pupa inside. The cocoons are then put into hot water to loosen the fine threads. Finally, these threads are reeled off the cocoons.
The length of unbroken thread produced by a single cocoon measures about one-and-a-half kilometers. Being twisted together several of these threads make single woven materials.
1. What is the purpose of the text...
A. To persuade readers to buy silk.
B. To put silk into different categories.
C. To entertain readers with the knowledge.
D. To present some points of view about silk.
E. To describe how silk comes into existence.
Answer : E
2. How are the threads on the outside of the cocoon…
A. Fine.
B. Soft.
C. Rough.
D. Strong.
E. Smooth.
Answer : C
3. What are mulberry leaves for…
A. Feeding caterpillars
B. Spinning cocoons.
C. Storing threads.
D. Hatching eggs.
E. Laying eggs.
Answer : A
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A geyser is the result of underground water under the combined conditions of high temperatures and increased pressure beneath the surface of the earth. Since temperature rises approximately 1 F for every sixty feet under the earth’s surface, and pressure increases with depth, the water that seeps down in crack and fissures until it reaches very hot rock in the earth interior becomes heated to temperature in excess of 290 F. Because of the greater pressure, the water shoots out of the surface in the form of steam and hot water. The result is a geyser. In order to function, then a geyser must have a source of heat, reservoir where water can be stored until the temperature rises to an unstable point, an opening through which the hot water and steam can escape, and underground channels for resupplying water after an eruption.
Favorable conditions for geyser exist in some regions of the world including New Zealand, Iceland, and the Yellowstone National Park area of the United States. The most famous geyser in the world is Old Faithfull in Yellow Park. Old Faithfull erupts almost every hour, rising to a height of 125 to 170 feet and expelling more than ten thousand gallons during each eruption.
4. Reservoir where the water can be stored will be after eruption and resupplying again…
A. hot
B. narrow
C. open
D. empty
E. unstable
Answer : C
5. “… and expelling more than ten thousand gallons during each eruption.” (Paragraph 2). The word “expelling” is closest in meaning to…
A. heating
B. melting
C. wasting
D. supplying
E. discharging
Answer : C
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