Previous Year UPSC Questions

Explanation

As per Article 281 of the Indian Constitution, the President of India is responsible for causing the recommendations of the Finance Commission to be laid before both Houses of Parliament, along with an explanatory memorandum on the action taken on its recommendations. Options (b), (c), and (d) are incorrect:

The Speaker of Lok Sabha oversees parliamentary proceedings but does not deal with Finance Commission recommendations. The Prime Minister and Union Finance Minister play roles in policy and implementation but do not have the constitutional responsibility mentioned under Article 281.

Explanation

Strengthening of capital markets was not a core focus of the Eleventh Five-Year Plan (2007-2012). The plan emphasized inclusive growth, focusing on poverty reduction, employment generation, gender equality, education, and health.

Explanation

CyberKnife is an advanced radiosurgery technology that allows real-time tracking and adjustment of radiation beams, ensuring precise targeting of tumors while minimizing damage to surrounding healthy tissues. These features make CyberKnife highly effective for treating tumors in sensitive areas such as the brain, spine, and lungs. Options (a), (b) and (c) are correct: CyberKnife is a non-invasive robotic radiosurgery system used to treat cancerous and non-cancerous tumors. It is a robotic image-guided system, capable of delivering extremely precise doses of radiation with sub-millimeter accuracy.

Option (d) is incorrect: CyberKnife is not designed to map the spread of tumors in the body. Its role is strictly limited to treating targeted tumor regions. Imaging techniques such as PET scans, CT scans, and MRIs are used to identify and map tumor spread, whereas CyberKnife focuses solely on delivering radiation therapy with exceptional precision.

Explanation

Indian cave paintings from the Gupta period (4th to 6th century CE) are notable for their refined artistry and spiritual themes, particularly Buddhist iconography. These paintings, found in caves like Ajanta, depict scenes from the life of the Buddha, Jataka tales, and celestial beings with vivid colors and graceful figures.

Option (a) is correct: The Bagh Caves in modern-day Madhya Pradesh are a significant site of ancient Indian art and architecture. Like the Ajanta Caves, these caves are known for their exquisite Gupta-period paintings dating back to the 4th to 6th centuries AD. The themes of the murals include Jataka tales, depictions of Bodhisattvas, and scenes of daily life.

Option (b), (c) and (d) are incorrect:

The Ellora Caves were primarily created by the Rashtrakuta dynasty between the 5th and 10th centuries for religious purposes, with Hindu, Buddhist, and Jain caves coexisting at the site. The Lomas Rishi Caves, located in Bihar, were created by the Mauryan dynasty around the 3rd century BCE. The Nasik Caves, also known as the PandavLeni Caves, are a group of ancient rock-cut Buddhist caves located in Nashik, Maharashtra. Nasik Caves belong to the Western Kshatrapas and the Satavahanas.

Explanation

The India-based Neutrino Observatory (INO) was designated as a mega science project in the 11th Five-Year Plan to promote research in high-energy physics.

Option (d) is correct: Neutrinos are subatomic particles that play a key role in understanding the fundamental forces of nature. Despite their elusive nature and weak interactions, they are essential to various processes in the universe, such as stellar re-actions and cosmic phenomena. Neutrinos are chargeless elementary particles that travel near the speed of light, making them difficult to detect. Neutrinos are produced in nuclear reactions, such as beta decay, which occurs in stars, nuclear reactors, and radioactive decay processes. In beta decay, a neutron decays into a proton, emitting a beta particle (electron) and a neutrino. Neutrinos have negligible but non-zero mass, confirmed through experiments in neutrino oscillation in particle physics. Neutrinos are incredibly abundant in the universe. It is estimated that trillions of neutrinos pass through the human body every second, and they are virtually undetectable because they interact very weakly with matter.

Explanation

This increasing concentration of a toxic substance as it moves up the food chain is known as biomagnification. Predators at the highest trophic levels like hawks suffer the most severe effects, including reproductive issues, weakened immune systems, and neurological damage due to the high pesticide load. When a chlorinated hydrocarbon pesticide like DDT enters the food chain, it accumulates in fatty tissues through bioaccumulation. As predators consume contaminated prey, the pesticide concentration increases, peaking in top predators due to biomagnification. Thus in the above food chain--Food crop Rat Snake Hawk--the hawk experiences the highest pesticide concentration.

Explanation

Golden rice is a genetically modified variety of rice specifically engineered to address vitamin A deficiency. The grains of Golden rice are biofortified with beta-carotene, a precursor of vitamin A (pro-vitamin A). When consumed, beta-carotene is converted into vitamin A in the human body, making golden rice an important dietary intervention to combat vitamin A deficiency, particularly in developing countries where this deficiency is prevalent and can lead to serious health issues like blindness.

Explanation

Biodiversity hotspot concept is promoted by Conservation international. Each biodiversity hot spot represents a remarkable universe of extraordinary floral and faunal endemicity struggling to survive in rapidly shrinking ecosystems. To qualify as a hotspot, a region must meet two strict criteria:

Species endemism: It must contain at least 1,500 species of vascular plants (> 0.5% of the world’s total) as endemics, and Degree of threat: It has to have lost at least 70% of its original habitat. Statements 1 and 2 are incorrect:

Biodiversity hotspots aren’t limited to tropical regions; examples include the Mediterranean Basin and California Floristic Province. While India is home to significant biodiversity but it has only three recognized hotspots. These hotspots are the Eastern Himalayas, Western Ghats and Andaman and Nicobar Islands. The Western Himalayas are not considered as a separate biodiversity hotspot.

Explanation

Tropical rainforests, also known as Evergreen forests, thrive in regions receiving substantial rainfall, typically exceeding 150-200 cm annually. These forests maintain temperatures within the range of 15-30°C throughout the year, conditions that match the given data. They are found in India’s Western Ghats and Northeast, boasting diverse flora (rosewood, mahogany, rubber) and fauna (elephants, monkeys, sloths). This combination of factors creates a complex and thriving ecosystem.

Explanation

El Niño is a climate pattern characterized by unusually warm ocean temperatures in the eastern equatorial Pacific Ocean. El Niño Modoki is a distinct phase of El Niño with a different spatial pattern of warming in the Pacific Ocean.

Statement 1 is incorrect: Because it reverses the typical locations of El Niño and El Niño Modoki. Normal El Niño occurs in the Eastern Pacific Ocean, where sea surface temperatures be-come unusually warm, typically around the equator off the coast of South America. El Niño Modoki, on the other hand, forms in the Central Pacific Ocean, with warming concentrated between the dateline and the central Pacific, distinct from the usual location of normal El Niño.

Statement 2 is correct: During normal El Niño events, the atmospheric changes (increased wind shear and cooler waters in the Atlantic) tend to suppress hurricane formation in the Atlantic Ocean, leading to fewer hurricanes. In contrast, El Niño Modoki causes different atmospheric conditions that have been linked to a greater frequency and intensity of hurricanes in the Atlantic Ocean. The shift in warming in the Pacific Ocean results in a different pattern of atmospheric circulation that enhances hurricane formation in the Atlantic.