Geography

* The summer solstice is the day with the longest period of daylight and the shortest night of the year. It occurs when one of the Earth's poles has its maximum tilt toward the Sun.


* On 21st June, the summer solstice occurs in the Northern Hemisphere. This is the longest day of the year for that hemisphere.

* The Arctic Circle, which is in the Northern Hemisphere, experiences continuous daylight throughout this day. This is because the tilt of the Earth's axis is such that the North Pole is facing towards the Sun.

* Therefore, the Sun does not set below the horizon at the Arctic Circle on this day.

Statement 1 is incorrect: Jet streams occur in both the Northern and Southern Hemispheres. They are fast-moving air currents found at high altitudes, typically around 10-15 kilometers above the Earth's surface, and exist in both hemispheres.

Statement 2 is correct: Not all cyclones develop an eye. Only certain strong cyclones, especially intense hurricanes or typhoons, develop a well-defined eye—a calm, low-pressure area at the center of the cyclone surrounded by the strongest winds.

Statement 3 is incorrect: The temperature in the eye can be several degrees Celsius warmer (typically 2–10°C) than the outer regions of the storm. This warmth is due to subsiding (sinking) air in the eye, which compresses and heats up adiabatically. Hence, option C is the correct answer.

This question concerns sugarcane propagation methods and comparative performance of different sett types. Statement 1 states that substantial saving in seed material is achieved when bud chip settlings are raised in a nursery and transplanted. Nursery-raised bud chip settlings use small propagules derived from a single bud or bud chips, thereby multiplying planting material more efficiently than using large setts. This reduces the quantity of seed cane required per hectare and is therefore correct from the standpoint of seed economy and modern propagation technology.

Statement 2 asserts that when direct planting of setts is done, germination percentage is better with single-budded setts than with setts with many buds. In reality, larger setts with multiple buds generally have higher germination and tillering potential under direct planting, because they contain more reserve food and meristematic tissue; single-budded setts may have lower germination when directly placed in the field. Therefore statement 2 is incorrect. Statement 3 claims that under bad weather during direct planting, single-budded setts have better survival than large setts; this is contrary to agronomic experience because larger setts tolerate adverse conditions better due to greater reserves, so statement 3 is incorrect.

Statement 4 states that sugarcane can be cultivated using settlings prepared from tissue culture. Tissue culture raised planting material is an established method to produce disease-free, true-to-type sugarcane plantlets that are subsequently hardened and used as settlings or transplants. This practice is part of modern seed production and nursery techniques and is correct. Combining the correct statements yields 1 and 4 only, which corresponds to option c.

Exam traps include confusing nursery transplanting advantages with direct planting responses and assuming single-budded setts always outperform larger setts; careful reading of physiological reserves and propagation science resolves the options. The final takeaway is that nursery bud chip multiplication and tissue culture derived settlings are resource-efficient and modern propagation tools, while single-budded setts are not superior for direct planting or in adverse conditions.

Statement 1 is incorrect. When we consider the distribution of water on Earth, we find that the amount of water in rivers and lakes is actually less than the amount of groundwater. This is because groundwater is stored in the Earth's crust, in the pores and spaces between rocks and soil, and it accounts for a significant portion of the Earth's fresh water. On the other hand, rivers and lakes, while visible and important for many ecosystems, actually hold a relatively small amount of the Earth's total water.


Statement 2 is correct. The amount of water in polar ice caps and glaciers is indeed more than the amount of groundwater. This is because these ice caps and glaciers, particularly those in Antarctica and Greenland, hold the majority of the Earth's fresh water.

Statement 1 is incorrect. High clouds are often thin and do not reflect very much. They let lots of the Sun's warmth in. They primarily transmit incoming solar radiation. At the same time, they trap some of the outgoing infrared radiation emitted by the Earth and radiate it back downward, thereby warming the surface of the Earth.

Statement 2 is incorrect. Low clouds are often quite thick and reflect lots of sunlight back to space. Low clouds are excellent reflectors. But, they don't stop the longwave energy from escaping to space. Therefore, low clouds help to cool the Earth.


The longest day of the year in the northern hemisphere, also known as the summer solstice, typically occurs in the second half of the month of June.

This is when the sun is directly over the Tropic of Cancer, or more specifically right over 23.5-degree north latitude.

The exact date can vary slightly from year to year, but it is usually on June 20th or 21st.


Continental drift: The movement of continents over millions of years has led to changes in the distribution of landmasses, altering habitats and creating opportunities for species to migrate, adapt, and diversify. It has influenced speciation events by creating barriers to gene flow and promoting allopatric speciation.

Glacial cycles: Fluctuations in global climate associated with glacial-interglacial cycles have had profound effects on ecosystems and species distributions. Periods of glaciation have resulted in the expansion and contraction of ice sheets, leading to changes in sea levels, habitats, and the distribution of flora and fauna. These environmental changes have driven evolutionary processes such as adaptation, migration, and extinction.

Therefore, both continental drift and glacial cycles have played significant roles in shaping the evolution of organisms.

The correct answer is 1 only (Thermal difference between land and water).

Statement 1 is correct: Land heats up and cools down much faster than water. This is because water has a higher specific heat capacity, meaning it takes more energy to heat it up and more energy to cool it down. Coastal areas, being influenced by large water bodies, experience a moderating effect on temperature fluctuations. The temperature changes are more gradual throughout the year.

Statement 2 is incorrect: While altitude can affect temperature (higher altitude generally means cooler temperatures), this is not the primary reason for the difference between continental interiors and coasts. Both continents and oceans have variations in altitude.

Statement 3 is incorrect: Winds can play a role in influencing local temperatures, but their presence wouldn't explain the consistent pattern of higher annual ranges seen in continental interiors.

Statement 4 is incorrect: Rainfall patterns can affect temperature to some extent, but coastal areas often receive more rainfall compared to continental interiors. This wouldn't explain the higher annual range observed inland.

All of the listed phenomena (1-6) are responsible for bringing dynamic changes on the surface of the Earth.

Electromagnetic Radiation: Sunlight drives weather patterns, influences temperatures, and is crucial for plant life (photosynthesis).

Geothermal Energy: Heat from the Earth's core fuels volcanic activity, drives plate tectonics, and shapes landforms.

Gravitational Force: The Moon's gravity creates tides in our oceans, influencing coastlines and erosion.

Plate Movements: The movement of tectonic plates causes mountain formation, earthquakes, and continental drift, constantly reshaping the Earth's surface.

Rotation of the Earth: Earth's rotation creates day and night cycles, affecting weather patterns and influencing wind and ocean currents.

Revolution of the Earth: Earth's revolution around the Sun causes seasons, impacting temperatures and weather patterns globally.

These forces act together in a complex interplay, constantly sculpting and reshaping the Earth's surface over vast timescales.

The distribution of Earth's freshwater is a standard physical geography fact. The vast majority of freshwater is locked in ice caps, glaciers and permanent snow. Of the remaining unfrozen freshwater, the largest single reservoir is groundwater. Groundwater in aquifers, including shallow and deep systems, constitutes a much larger share than surface freshwater bodies like lakes and rivers, atmospheric moisture, or soil moisture. Thus option c, 'exists as groundwater', is the correct choice in conventional Earth water budget accounting.

To elaborate on magnitudes: glaciers and ice hold about 68-69% of global freshwater. The next largest store is groundwater, which holds roughly 30% of the freshwater after excluding ice, vastly exceeding the volumes in lakes, rivers, and the atmosphere. Freshwater lakes and rivers together constitute a very small percentage of total freshwater, and atmospheric water as moisture and clouds is negligible by volume compared with groundwater. Soil moisture is also a minor reservoir relative to groundwater. These quantitative relations are frequently tested in prelims and must be recalled accurately.

Why other options are wrong: option a, atmosphere, is attractive because we experience weather, but the atmosphere holds only a tiny fraction of freshwater at any time. Option b, lakes and rivers, contains important surface water but their combined volume is far smaller than groundwater. Option d, soil moisture, is critical for ecosystems and agriculture but is limited in total volume and residence time. Groundwater, in contrast, represents a large, relatively stable reservoir distributed in subsurface aquifers and thus dominates the non-ice freshwater stock.

Exam technique note: remember the two largest stores by far are ice and glaciers first, then groundwater. Many students mistakenly emphasize lakes and rivers because they are visible, but in objective tests you must prefer groundwater when asked about the largest share of remaining unfrozen freshwater. Therefore option c is the correct and defensible answer with high confidence.

The Earth's axis is tilted at an angle of 23.5 degrees relative to its path around the Sun. This tilt means that different parts of the Earth receive direct sunlight for varying lengths of time throughout the year, leading to seasonal changes in day and night length.

Hence, the correct answer is B.

Statement 1 is Incorrect: The westerlies blow between 30° and 60° latitudes in both hemispheres, not between 30° N and 60° S. So, the latitudinal extent mentioned is wrong; it should be 30°–60° N and 30°–60° S.

Statement 2 is Correct: The western disturbances that bring winter rainfall to north-western India originate over the Mediterranean region and are carried by the westerlies. Hence, these moist air masses are indeed part of the westerly wind system.