Climate & Monsoon — Set 2

Correct Answer: D. Western Ghats

• **Western Ghats** = the first land barrier struck by the Arabian Sea branch of the Southwest Monsoon, receiving extremely heavy coastal rainfall. • **Konkan-Karnataka-Kerala coast** — the three coastal regions that receive the heaviest rainfall from the Arabian Sea monsoon branch. • 💡 Wrong-option analysis: Meghalaya Plateau: receives rainfall from Bay of Bengal branch, not Arabian Sea; Odisha Coast: receives Bay of Bengal branch rain; West Bengal: also Bay of Bengal branch rain.

Correct Answer: B. Monsoon

• **Monsoon type climate** = India's climate is predominantly classified as monsoon, characterized by a seasonal reversal in wind direction. • **South and South-East Asia** — the primary geographic zone where the monsoon climate type prevails globally. • 💡 Wrong-option analysis: Tundra: extremely cold climate of polar regions; Mediterranean: dry summer, wet winter climate (e.g., southern Europe); Equatorial: year-round hot and wet climate near the equator.

Correct Answer: A. Over the Ganga plains

• **ITCZ shifts over the Ganga plains** = during Indian summer, the Inter-Tropical Convergence Zone moves northward and acts as the 'monsoon trough', attracting moisture-laden winds. • **Monsoon trough** — the term used for the ITCZ when positioned over the Ganga plains, driving the main monsoon circulation. • 💡 Wrong-option analysis: Tibetan Plateau: the plateau causes upper-level heating but ITCZ itself shifts to Ganga plains; Southern Peninsula: that is the winter position of the ITCZ; Indian Ocean: the ITCZ is over the ocean only in the non-monsoon season.

Correct Answer: C. Parallel to the direction of the monsoon winds

• **Aravalli range lies parallel to monsoon winds** = the winds pass over the range without being forced to rise, so no orographic rain forms in western Rajasthan. • **Parallel orientation** — the Aravalli's NE-SW alignment matches the Arabian Sea monsoon wind direction, allowing winds to slip past without lifting. • 💡 Wrong-option analysis: Too far from the sea: distance is not the key factor; the orientation is; High-pressure zone: not a permanent feature in Rajasthan; Perpendicular to winds: that would actually cause rainfall — the opposite of the reality.

Correct Answer: B. Ocean Tides

• **Ocean tides** = a localized gravitational phenomenon that does NOT influence India's long-term climate, unlike latitude, altitude, and wind systems. • **Gravity-driven tidal cycle** — tides are caused by Moon/Sun gravity and are local/short-term, irrelevant to regional climate patterns. • 💡 Wrong-option analysis: Pressure and Winds: directly control the monsoon and seasonal weather; Latitude: determines the amount of solar insolation and temperature zones; Altitude: affects temperature (lapse rate), precipitation, and vegetation.

Correct Answer: D. Rajasthan

• **Rajasthan (Thar Desert region)** = receives the least rainfall in India, often less than 25 cm annually due to lack of mountain barriers. • **Less than 25 cm annual rainfall** — the average precipitation in Western Rajasthan, making it India's driest region. • 💡 Wrong-option analysis: Punjab: well-irrigated, receives Western Disturbance rain in winter; Tamil Nadu: receives NE monsoon rain in winter; Bihar: receives SW monsoon rain, relatively adequate.

Correct Answer: A. October to November

• **Retreating monsoon lasts October to November** = begins withdrawing from NW India in September, clearing the entire country by late November. • **September to late November** — the full period of monsoon retreat, with Punjab withdrawing first and Tamil Nadu last. • 💡 Wrong-option analysis: June to September: this is the advance/onset period of the SW monsoon; March to May: the pre-monsoon hot season; December to February: the cold dry winter season.

Correct Answer: B. Dry spells during the rainy season

• **Break in Monsoon** = dry spell of little to no rain for a few weeks during the monsoon season when the trough shifts to the Himalayan foothills. • **Monsoon trough shifts north** — when the trough moves to the Himalayan foothills, the central plains get a dry break while the foothills receive heavy rain. • 💡 Wrong-option analysis: End of monsoon: the monsoon ends in November, but a 'break' is within the season; Heavy rain in winter: that is from Western Disturbances; Monsoon arrival in Himalayas: happens in June, not the same as a mid-season break.

Correct Answer: A. Tropical Savannah (Aw)

• **Tropical Savannah (Aw) climate** = most of the Indian peninsula falls under this Koeppen category, with a distinct dry winter and hot temperatures year-round. • **Distinct dry winter** — the defining seasonal feature of Aw climate that separates it from purely equatorial (always wet) climate. • 💡 Wrong-option analysis: Dry Climate (B): found in Rajasthan/NW India, not the main peninsula; Polar (E): found only in high-latitude tundra regions; Tundra (ET): extremely cold high-altitude/latitude regions.

Correct Answer: A. Arakan Yoma

• **Arakan Yoma (Myanmar)** = the first mountain range struck by the Bay of Bengal branch of the monsoon, deflecting winds westward into the Ganga plains. • **Deflection into Ganga plains** — the Arakan Yoma's role in turning the Bay of Bengal monsoon westward, causing high rainfall in Meghalaya and Assam. • 💡 Wrong-option analysis: Himalayas: block further northward movement of monsoon but are not the first barrier; Western Ghats: struck by Arabian Sea branch, not Bay of Bengal; Eastern Ghats: too low and discontinuous to be the primary first barrier.