Climate of India

The S.W. monsoon (Southwest Monsoon) is primarily caused by low pressure over the Punjab plain and the Himalayas acting as a barrier to moisture-laden winds. These factors create the pressure differential that drives monsoon circulation. Option A correctly identifies factors 1 and 4.

Correct Answer: it is rain shadow region of Himalayas

Thiruvananthapuram has higher rainfall in summer and it is nearer to the equator

Dew point measures atmospheric moisture, hygrogram records humidity changes, and Stevenson screen houses weather instruments. Flash point refers to the lowest temperature at which a volatile substance evaporates to form an ignitable mixture with air - it's related to chemistry/flammability, not climate study.

Winter rain in Northwest India is caused by Western disturbances (1 correct). Summer rain in Bengal comes from North-Westesterly winds (3 correct). Winter rain in Tamil Nadu is from Northeast Monsoon (4 correct). However, summer rain in Malabar coast is from Southwest monsoon, not retreating monsoon (2 incorrect). Therefore, 1, 3, and 4 are correct.

Tamil Nadu receives rainfall during October-November from the Northeast monsoon (retreating monsoon), which brings 10-20 cm. Himachal Pradesh also receives winter rain from Western disturbances. The pattern describes regions with specific seasonal rainfall concentration. Option A is correct.

The climatic characteristics show high temperatures year-round (19-32°C) with heavy rainfall (200 cm). This pattern with small annual temperature range and high precipitation is typical of the humid west coast and Sahyadri region (Western Ghats). Option D correctly identifies this zone.

Tropical evergreen forests grow in high-rainfall areas like Shillong plateau and Sahyadris (Western Ghats). Monsoon forests are found in Chhotanagpur plateau and Siwaliks which receive seasonal rains. Temperate forests occur in Himalayas and Nilgiris at higher altitudes, while mangroves thrive in coastal areas like West Bengal and Terai deltas. The correct matching is A-2, B-1, C-4, D-3.

In meteorology, a 'depression' refers to a region of low atmospheric pressure relative to its surroundings. This low pressure creates conditions that can lead to cloud formation, rainfall, and potentially stormy weather. The term describes the pressure deficit itself, not an emotional state or broad low-pressure area.

The Central Asian highlands develop high atmospheric pressure during winter, which creates a pressure gradient affecting India's climate. This pressure system influences the onset and timing of the Indian monsoon by affecting wind patterns and moisture movement. The relationship is particularly significant for monsoon dynamics rather than general summer atmospheric effects.

If Aravalli ranges were from East to West, the western Rajasthan would never have been a desert.

Deserts by definition receive less than 25 cm of annual rainfall. Hot deserts are typically located in tropical regions between 15° and 30° latitudes where descending dry air creates arid conditions. Rainfall generally decreases away from the equator towards these latitudes, not increases. Mediterranean regions experience dry summers due to shifting pressure belts, concentrating rainfall in winter.