IELTS Academic Reading Practice Test 69

The potato is often treated as a humble and unremarkable food, but its history is far more consequential than its rough brown skin suggests. For most of human history, this familiar food was unknown outside the Americas. First domesticated on the high plateaus of the Andes, it is now the fourth most important staple crop in the world, after rice, wheat and maize. It has sustained growing populations, eased the rise of industrial towns, and at times caused disaster when it failed. The story of the potato also shows how a single plant can reshape diets, economies and national histories across several continents.

Wild relatives of the potato still grow in the cool, high-altitude regions of the Andes, particularly in what is now southern Peru and north-western Bolivia. Archaeological evidence indicates that local peoples began domesticating these plants between 8,000 and 10,000 years ago, long before the rise of the Inca empire. Over generations they selected tubers that could tolerate freezing nights, thin soils and sharp variations in rainfall. The tubers supplied a dependable source of energy at altitudes where other staple crops, such as maize, could not be cultivated.

The first potatoes reached Europe during the second half of the sixteenth century, when Spanish explorers brought them from the Andes. For a long time the new plant was treated with suspicion. Some people refused to eat it because it was not mentioned in the Bible, and others noted that it belonged to the same botanical family as poisonous nightshade plants. It was initially grown mainly as a curiosity in gardens, and even when it slowly entered the kitchen, many regarded it as food for the poor or for animals rather than for respectable households.

Gradually, however, the potato overcame this resistance. Farmers discovered that it produced more food per unit of land than many traditional crops, and that it could be left in the ground until needed, making it harder for armies to destroy than grain. By the late eighteenth century it had become a common field crop across much of northern Europe, and nowhere more so than in Ireland, where the cool, moist climate suited it perfectly. For many Irish labourers and their families, the potato became the main source of nourishment.

This reliance proved catastrophic when a fungus-like organism, Phytophthora infestans, reached Europe in the mid-1840s. The disease, known as late blight, destroyed potato crops with terrifying speed, turning healthy tubers into blackened, rotting masses within days. Between 1845 and 1852 the Irish potato crop failed repeatedly, causing the deaths of around one million people and forcing at least another million to emigrate. The famine had profound political and social consequences, accelerating Irish migration to Britain, North America and Australia and leaving a legacy of bitterness toward the British government.

The disaster also taught scientists an important lesson about agricultural biodiversity. Because most European potatoes had been grown from a very narrow genetic base, they had little resistance to the new disease. In the twentieth century, plant breeders crossed cultivated potatoes with wild Andean varieties to introduce genes for resistance to blight and other diseases. Today the potato's centre of genetic diversity remains in the Andes, where farmers continue to grow thousands of distinct local varieties, many of them little changed from those grown centuries ago.

From Europe the potato spread to almost every part of the globe. European traders took it to India and China; colonial administrators and missionaries carried it to Africa and the Pacific. In the twentieth century it became a major crop in China, which is now by far the world's largest producer, followed by India and Russia. Global production exceeds 350 million tonnes a year, and the potato is grown in well over 100 countries, from subtropical lowlands to mountain valleys more than 4,000 metres above sea level.

Part of the potato's success lies in its nutritional value. A medium-sized tuber provides significant amounts of vitamin C, several B vitamins, potassium and complex carbohydrates, while containing very little fat. It can be stored for months under the right conditions, and its high yield means that a small plot of land can support a family. For these reasons, development agencies have promoted the potato as a crop that can improve food security in poor regions, although it is less suited to the very hottest climates.

Yet the potato also faces serious challenges. Late blight remains a major threat, and the pathogen continues to evolve, overcoming some of the resistance bred into modern varieties. Climate change is altering rainfall patterns and increasing the frequency of drought in some potato-growing areas, while warmer winters allow pests to survive in regions where they were once unknown. Scientists argue that the genetic resources conserved in the Andes and in international gene banks will be essential for breeding potatoes that can cope with these new conditions.

The potato's journey from a wild Andean plant to a global staple is a reminder of the power of biological exchange, but also of its dangers. A food that once helped prevent famine in Europe later became the cause of one of the most terrible famines of the nineteenth century. Its history shows how human societies, crops and diseases are connected across continents, and why the preservation of crop diversity is not merely a scientific concern but a matter of survival.

Each year, more than a million wildebeest move across the Serengeti-Mara ecosystem in East Africa, accompanied by roughly 200,000 zebras and 300,000 Thomson's gazelles. This continuous circuit, often called the Great Migration, takes the herds from the short-grass plains of the southern Serengeti in Tanzania northwards to the Maasai Mara in Kenya and back again. It is one of the largest movements of land mammals on Earth, covering a distance of 1,000 kilometres or more each year, and it has become a major tourist attraction. Yet the migration is not a single organised march; it is a loose, ever-changing flow of individuals responding to rainfall, grass growth and predation. The precise route varies from year to year, and the animals are spread over hundreds of square kilometres at any moment.

The migration is driven primarily by the search for food and water. In the southern Serengeti, the wet season from November to May produces lush grasses that are rich in nutrients, and this is where the wildebeest gather to feed and give birth. As the rains end and the grasses dry out, the herds begin to move north and west, following the remaining green vegetation. The animals are constantly on the move, but they do not simply travel in a straight line; they loop back, split into smaller groups and sometimes remain in one area for weeks if fresh grass is available. The timing of the migration therefore depends on the timing of the rains, which varies considerably from year to year and across the region. Scientists have used satellite images of vegetation and rainfall to track these movements and to understand how the herds make decisions about where to go next.

The most dramatic concentration occurs during the calving season, usually between January and March, when around half a million calves are born on the southern plains within a few weeks. The synchronised births overwhelm predators such as lions, hyenas and leopards, which cannot possibly eat all the young. The calves can stand within minutes and are able to run with the herd soon after, which greatly increases their chances of survival. Nevertheless, many are taken by predators, and the calving grounds are also a magnet for vultures and other scavengers. The nutrient-rich grasses of the southern plains are essential for the lactating mothers, and any delay in the rains can reduce calf survival. Researchers have found that the timing of birth is closely linked to the quality of the grass, which in turn depends on the amount and timing of rainfall in the preceding months.

As the dry season deepens, the herds must cross several rivers, the largest of which is the Mara River. These crossings are among the most dangerous moments of the migration. The riverbanks are steep and crowded, and the animals often hesitate for hours before plunging in. Crocodiles lie in wait, and many wildebeest drown in the crush or are swept away by the current. Those that survive the crossing may still face lions and other predators on the far bank. Despite the risks, the crossings are a spectacle that draws thousands of tourists each year, and they have been filmed in countless documentaries. The best-known crossings occur between July and October, but the exact timing depends on water levels and the movement of the herds. Some years the herds cross several times, moving back and forth as the rains and grass conditions change.

The migration has profound effects on the landscape. The sheer number of grazing animals trims the grass, encourages new growth and recycles nutrients through their dung and urine. Their hooves break up the soil and help seeds to germinate. When thousands of animals die during the crossings or from starvation, their bodies provide food for scavengers and return nutrients to the river and the land. The migration also supports a large predator population, including lions, cheetahs, hyenas and crocodiles, which would not survive at such densities without the seasonal abundance of prey. For this reason, the Serengeti-Mara ecosystem is one of the most productive natural grasslands in the world, and it is recognised as a UNESCO World Heritage Site and a Biosphere Reserve. The seasonal pulse of life therefore benefits many species beyond the wildebeest themselves.

Despite its apparent robustness, the migration faces growing pressures. Human populations around the protected areas are increasing, and land is being converted to agriculture, blocking traditional routes. Poaching, though reduced in recent decades, remains a threat in some areas. There are also proposals for roads and other infrastructure that could fragment the ecosystem. Climate change is making rainfall patterns less predictable, which may disrupt the timing of the migration and reduce the availability of grass. Conservationists argue that protecting the migration requires cooperation between Tanzania and Kenya, as well as the involvement of local communities who must benefit from the wildlife that surrounds them. Fences, if poorly planned, could be especially damaging, because wildebeest need to move freely across the landscape. Without connected protected areas and careful planning, the Great Migration could become a much smaller and less predictable phenomenon. Some scientists warn that once migration routes are blocked, they may never be re-established.

International sporting contests are among the few occasions on which millions of people openly display national symbols. Flags are waved, anthems are sung, and victories are described as national triumphs. Politicians are quick to associate themselves with successful teams, while defeat can produce a strange collective mourning. But what does sport actually do for national identity? Does it genuinely bind citizens together, or does it merely provide a temporary and superficial sense of belonging? This question is more difficult than it appears.

The connection between sport and nationalism is not new. In the late nineteenth century, as modern nation-states were consolidating, organised games such as football, cricket and rugby expanded rapidly. These sports were codified in Britain and spread through empire, trade and education, becoming markers of class, region and nation. Early international matches, such as the first football international between Scotland and England in 1872, were framed as contests between peoples. In many countries, sport became part of state-building, used to promote physical fitness, discipline and loyalty.

There are moments when sport appears to unify a nation. The 1995 Rugby World Cup in South Africa is often cited as a powerful example. Hosted just a year after the end of apartheid, the tournament saw the Springboks, a team historically associated with white South Africans, win the final in Johannesburg. When Nelson Mandela, wearing a Springbok jersey and cap, presented the trophy to captain Francois Pienaar, the image was interpreted around the world as a symbol of reconciliation. Many South Africans, black and white, celebrated together. Yet even this remarkable moment had limits: rugby remained a predominantly white sport, and the deeper inequalities of South African society did not disappear.

Sport can also expose and deepen divisions. Within many nations, regional or ethnic loyalties are stronger than national ones. Football rivalries such as that between Barcelona and Real Madrid are loaded with political meaning, with Barcelona long seen as a symbol of Catalan identity and Real Madrid associated with Spanish centralism. In Belgium, tensions between Flemish and French-speaking communities are sometimes played out through support for different teams and clubs. Even when a national team plays, supporters may wave regional flags as well as national ones, and defeats can provoke recriminations against particular groups. International sport does not simply erase internal conflicts; it can make them more visible.

Political scientists have tried to explain these effects. Benedict Anderson famously described nations as 'imagined communities' because most members will never meet one another, yet they imagine themselves as part of a shared whole. The mass media, especially television, allow millions of people to experience the same sporting event at the same time, creating a collective ritual. However, this imagined togetherness is not automatic. The meanings of a match are constructed by commentators, politicians and audiences. Moreover, commercial broadcasting and sponsorship have turned international sport into a global industry that often appeals to consumers rather than citizens.

The globalisation of sport also complicates the link between team and nation. Many athletes now play for clubs in foreign countries, and their club careers may matter more to them than representing their country. Fans may follow a foreign league more closely than their domestic one, and multinational corporations use national teams for marketing while having no real connection to the nation. At the same time, some national teams include players or coaches from abroad, and the definition of who can represent a nation is constantly debated. This does not mean national identity has disappeared from sport; if anything, international tournaments still generate enormous passion. But it means that the connection between a team and a people is no longer as simple as it once seemed.

My view is that sport is a powerful but unreliable instrument of national identity. It can produce genuine moments of collective emotion, but these are usually short-lived and easily romanticised. The unity felt after a victory rarely translates into lasting social or political change. Sport can provide a peaceful arena for rivalries, and it can give minorities a visible place in national life. However, its ability to bind a nation depends on existing social conditions, not on the game itself. A deeply divided society will not be healed by a single trophy. Nevertheless, sport can open conversations about identity and belonging that might otherwise remain closed.

We should therefore be cautious about using sport as a tool of nationalism. When governments or corporations promote sporting success as a sign of national greatness, they often exaggerate its significance and ignore its costs. The enormous sums spent on stadiums and elite training might be better used to provide ordinary people with opportunities to play. National teams can inspire, but they can also distract attention from political failures. The challenge is to enjoy the drama and belonging that sport offers without mistaking it for a solution to the deep problems that face any country.

In the end, sport is a mirror held up to the nation. It reflects the hopes, divisions and contradictions of the society that watches it. Sometimes the reflection is flattering; sometimes it is uncomfortable. What sport rarely does is create something new. Whether a national team becomes a source of pride or a reminder of inequality depends less on the scoreboard than on the history and politics that surround the game.