UPSC Static Quiz – Geography : 19 November 2025

Solution: A

• Statement I is correct. Epiphytes are plants that grow harmlessly upon other plants (such as trees) and derive their moisture and nutrients from the air, rain, and debris accumulating around them. They are a hallmark of Tropical Rainforests, where the canopy and branches of trees are often covered in orchids, bromeliads, ferns, and mosses. In contrast, they are much rarer in Temperate Deciduous Forests.
• Statement II is correct. The Tropical Rainforest offers a perfect habitat for epiphytes: year-round high humidity provides the necessary moisture, consistent warmth supports growth, and the tall, complex canopy provides a substrate. Conversely, the Temperate Deciduous Forest presents major challenges: cold winters with freezing temperatures can damage epiphyte tissues, the air is much drier, and most importantly, the annual shedding of leaves and bark by the host trees would dislodge any epiphytes that managed to establish themselves.
• Therefore, both statements are correct, and Statement II is the correct explanation for Statement I.

Solution: A

• Statement-I is correct. Transhumance is the specific term for the seasonal, cyclical movement of herders and their livestock. It typically involves moving to higher-altitude mountain pastures (known as ‘alps’ in Europe or ‘bugyals’ in the Himalayas) during the summer months and returning to lower-altitude valleys or plains during the winter. This is a well-documented practice among communities like the Gujjars and Bakarwals of the Himalayas, and in mountainous regions of Europe and Central Asia.
• Statement-II is correct. The motivation for this migration is entirely environmental and resource-based. In winter, high-altitude pastures are covered in snow and are inaccessible, forcing herders to move to the warmer lowlands where fodder is available. In summer, the lowlands can become hot and dry, and the pastures may be overgrazed. Simultaneously, the melting snow in the highlands reveals fresh, nutritious grasslands, prompting the upward migration. This movement is a rational adaptation to maximize the use of pastures that are only seasonally available due to climatic conditions.
• Therefore, Statement-II is the correct explanation for Statement-I.

Solution: D

• The extreme hyper-aridity of the Atacama Desert is a textbook example of multiple geographical factors working in concert. Statement (d) correctly identifies the two most critical factors.
• Firstly, the Atacama is located on the western side of the Andes Mountains. The prevailing moisture-laden winds are the southeast trade winds, which are forced to rise over the Andes, dropping their moisture on the eastern slopes (orographic rainfall). By the time the air descends on the western side, it is extremely dry, creating a pronounced rain-shadow effect.
• Secondly, the coast is flanked by the cold Peru (or Humboldt) Current. This cold ocean current cools the air above it, lowering its capacity to hold moisture. It also creates a temperature inversion, where a layer of cool air is trapped beneath a layer of warmer air.
• This inversion is very stable and prevents the formation of rain-bearing convection clouds. While the cold current can produce fog (known as camanchaca), it yields virtually no precipitation. The combination of this coastal cooling and the mountain rain-shadow creates the perfect conditions for extreme dryness.

Solution: D

• Statement 1 is incorrect. Pisciculture refers to the farming of fish. However, in the broader context of aquaculture practices in India, it often includes the farming of both fin fish and shellfish (like prawns and shrimps). The term aquaculture is more comprehensive, but pisciculture is not strictly limited to only fin fish in common parlance and practice.
• Statement 2 is incorrect. Composite Fish Culture is a technology developed to maximize fish yield from a pond. It involves stocking multiple, complementary species of fish (typically 5 or 6 species) in a single pond. These different species have different food habits and occupy different ecological niches (surface feeders, column feeders, bottom feeders) in the pond. This ensures that all the food resources in the pond are utilized efficiently, leading to higher overall production and minimizing competition between species. Stocking a single species is known as monoculture.

Solution: C

• Pleistocene Epoch (1-D): This epoch, starting about 2.6 million years ago, is defined by the repeated cycles of glaciation known as the Ice Ages. It is also the epoch during which modern humans, Homo sapiens, evolved and spread across the globe.
• Pliocene Epoch (2-B): Following the Miocene, the Pliocene (5.3 to 2.6 million years ago) is noted for the appearance of the first recognizable hominids, such as Australopithecus, in Africa. This marks a critical step in human evolution.
• Miocene Epoch (3-A): This epoch (23 to 5.3 million years ago) saw a global cooling and drying trend, which led to the expansion of grasslands at the expense of forests. This environmental shift drove the evolution and diversification of large grazing mammals, including ancestors of modern horses, camels, and antelopes.
• Eocene Epoch (4-C): Occurring after the extinction of the dinosaurs, the Eocene (56 to 34 million years ago) was a period of significant mammalian radiation. It saw the emergence of the first members of many modern mammalian orders, including the earliest primates and the first small, dog-sized horses (Hyracotherium).