Cork
Cork – the thick bark of the cork oak tree (Quercus suber) – is a remarkable material. It is tough, elastic, buoyant, and fire-resistant, and suitable for a wide range of purposes. It has also been used for millennia: the ancient Egyptians sealed their sarcophagi (stone coffins) with cork, while the ancient Greeks and Romans used it for anything from beehives to sandals.
And the cork oak itself is an extraordinary tree. Its bark grows up to 20 cm in thickness, insulating the tree like a coat wrapped around the trunk and branches and keeping the inside at a constant 20oC all year round. Developed most probably as a defence against forest fires, the bark of the cork oak has a particular cellular structure – with about 40 million cells per cubic centimetre – that technology has never succeeded in replicating. The cells are filled with air, which is why cork is so buoyant. It also has an elasticity that means you can squash it and watch it spring back to its original size and shape when you release the pressure.
Cork oaks grow in a number of Mediterranean countries, including Portugal, Spain, Italy, Greece and Morocco. They flourish in warm, sunny climates where there is a minimum of 400 millimetres of rain per year, and not more than 800 millimetres. Like grape vines, the trees thrive in poor soil, putting down deep roots in search of moisture and nutrients. Southern Portugal’s Alentejo region meets all of these requirements, which explains why, by the early 20th century, this region had become the world’s largest producer of cork, and why today it accounts for roughly half of all cork production around the world.
Most cork forests are family-owned. Many of these family businesses, and indeed many of the trees themselves, are around 200 years old. Cork production is, above all, an exercise in patience. From the planting of a cork sapling to the first harvest takes 25 years, and a gap of approximately a decade must separate harvests from an individual tree. And for top-quality cork, it’s necessary to wait a further 15 or 20 years. You even have to wait for the right kind of summer’s day to harvest cork. If the bark is stripped on a day when it’s too cold – or when the air is damp – the tree will be damaged.
Cork harvesting is a very specialised profession. No mechanical means of stripping cork bark has been invented, so the job is done by teams of highly skilled workers. First, they make vertical cuts down the bark using small sharp axes, then lever it away in pieces as large as they can manage. The most skilful cork-strippers prise away a semi-circular husk that runs the length of the trunk from just above ground level to the first branches. It is then dried on the ground for about four months, before being taken to factories, where it is boiled to kill any insects that might remain in the cork. Over 60% of cork then goes on to be made into traditional bottle stoppers, with most of the remainder being used in the construction trade. Corkboard and cork tiles are ideal for thermal and acoustic insulation, while granules of cork are used in the manufacture of concrete.
Recent years have seen the end of the virtual monopoly of cork as the material for bottle stoppers, due to concerns about the effect it may have on the contents of the bottle. This is caused by a chemical compound called 2,4,6-trichloroanisole (TCA), which forms through the interaction of plant phenols, chlorine and mould. The tiniest concentrations – as little as three or four parts to a trillion – can spoil the taste of the product contained in the bottle. The result has been a gradual yet steady move first towards plastic stoppers and, more recently, to aluminium screw caps. These substitutes are cheaper to manufacture and, in the case of screw caps, move convenient for the user.
The classic cork stopper does have several advantages, however. Firstly, its traditional image is more in keeping with that of the type of high quality goods with which it has long been associated. Secondly – and very importantly – cork is a sustainable product that can be recycled without difficulty. Moreover, cork forests are a resource which support local biodiversity, and prevent desertification in the regions where they are planted. So, given the current concerns about environmental issues, the future of this ancient material once again looks promising.
Question (1)
Do the following statements agree with the information given in Reading Passage 1?
In boxes 1-5 on your answer sheet, write
TRUE if the statement agrees with the information
FALSE if the statement contradicts the information
NOT GIVEN if there is no information on this
1
The cork oak has the thickest bark of any living tree.
2
Scientists have developed a synthetic cork with the same cellular structures as natural cork.
3
Individual cork oak trees must be left for 25 years between the first and second harvest.
4
Cork bark should be stripped in dry atmospheric conditions.
5
The only way to remove the bark from cork oak trees is by hand.
Questions 6 - 13
Complete the notes bolow.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 6-13 on your answer sheet.
Comparison of aluminium screw caps and cork bottle stoppersAdvantages of aluminium screw caps • do not affect the 6 of the bottle contents • are 7 to produce • are 8 to use Advantages of cork bottle stoppers • suit the 9 of quality products • made from a 10 material • easily 11 • cork forests aid 12 • cork forests stop 13 happening |
Complete the sentences below.
Choose ONE WORD ONLY from the passage for each answer.
Write your answers in boxes 14-21 on your answer sheet.
The writer mentions collecting
14
as an example of collecting in order to make money.
Collectors may get a feeling of 15 from buying and selling items.
Collectors’ clubs provide opportunities to share
16
Collectors’ clubs offer
17
with people who have similar interests.
Collecting sometimes involves a life-long
18
for a special item.
Searching for something particular may prevent people from feeling their life is completely
19
Stamp collecting may be
20
because it provides facts about different countries.
21
tends to be mostly a male hobby.
Question (22)
Do the following statements agree with the information given in the passage on pages 20 and 21?
In boxes 22-26 on your answer sheet, write
TRUE if the statement agrees with the information
FALSE if the statement contradicts the information
NOT GIVEN if there is no information on this
22
The number of people buying dolls has grown over the centuries.
23
Sixteenth century European dolls were normally made of wax and porcelain.
24
Arranging a stamp collection by the size of the stamps is less common than other methods.
25
Someone who collects unusual objects may want others to think he or she is also unusual.
26
Collecting gives a feeling that other hobbies are unlikely to inspire.
Reading Passage 3 has six sections, A-F.
Choose the correct heading for each section from the list of headings below.
Write the correct number, i-viii, in boxes 27-32 on your answer sheet.
List of Headings
i | Courses that require a high level of commitment |
ii | A course title with two meanings |
iii | The equal importance of two key issues |
iv | Applying a theory in an unexpected context |
v | The financial benefits of studying |
vi | A surprising course little |
vii | Different names for different outcomes |
viii | The possibility of attracting the wrong kind of student |
Section A
27
Section B
28
Section C
29
Section D
30
Section E
31
Section F
32
Questions 33 - 36
Complete the summary below.
Choose NO MORE THAN TWO WORDS from the passage for each answer.
Write your answers in boxes 33-36 on your answer sheet.
The ‘Arson for Profit’ courseThis is a university course intended for students who are undergraduates and who are studying 33 The expectation is that they will become 34 specialising in arson. The course will help them to detect cases of arson and find 35 of criminal intent, leading to successful 36 in the courts. |
Question (37)
Do the following statements agree with the views of the writer in Reading Passage 3?
In boxes 37-40 on your answer sheet, write
YES if the statement agrees with the views of the writer
NO if the statement contradicts the views of the writer
NOT GIVEN if it is impossible to say what the writer thinks about this
37
It is difficult to attract students onto courses that do not focus on a career.
38
The ‘Arson for Profit’ course would be useful for people intending to set fire to buildings.
39
Fire science courses are too academic to help people to be good at the job of firefighting.
40
The writer’s fire science students provided a detailed definition of the purpose of their studies.