Consider the following statements 1. Convection rainfall occurs only in equatorial region. 2. On the western margins of the continents in the middle and high latitudes, the rainfall is highly cyclonic. 3. The east Himalayan region of India gets high rainfall from the south west monsoon in summer. Which one of the statements given above the correct?

Consider the following statements 1. Convection rainfall occurs only in equatorial region. 2. On the western margins of the continents in the middle and high latitudes, the rainfall is highly cyclonic. 3. The east Himalayan region of India gets high rainfall from the south west monsoon in summer. Which one of the statements given above the correct? Correct Answer 2 and 3

The correct answer is 2 and 3.

Key Points

  • Convectional rainfall
    • It occurs when the energy of the sun heats the Earth, causing water to evaporate to form water vapour.
    • Convectional rainfall is prevalent in equatorial regions.
    • It is also found in the northern hemisphere. Hence, Statement 1 is not correct.
    • In these, the warm air rises up and expands then, reaches a cooler layer and saturates, then condenses mainly in the form of cumulus or cumulonimbus clouds.
    • In the equatorial regions, the precipitation due to convectional rainfall occurs in the afternoon.
  • Desert
    • A desert is a barren area of landscape where little precipitation occurs and consequently, living conditions are hostile to plant and animal life.
    • In other words, it is an extremely dry area of land with sparse vegetation.
    • The lack of vegetation exposes the unprotected surface of the ground to the processes of denudation (the wearing away of the Earth's surface by moving water, by ice, by wind, and by waves, leading to a reduction in elevation and in relief of landforms and of landscapes).
    • On the western margins of the continents in the middle and high latitudes, the rainfall is highly cyclonic. Hence, Statement 2 is correct.
  • Distribution of Rainfall in India
    • The average annual rainfall in India is about 125 cm, but it has great spatial variations.
    • The highest rainfall occurs along the west coast, on the Western Ghats, as well as in the sub-Himalayan areas in the northeast and the hills of Meghalaya. Here the rainfall exceeds 200 cm. In some parts of Khasi and Jaintia hills, the rainfall exceeds 1,000 cm. In the Brahmaputra valley and the adjoining hills, the rainfall is less than 200 cm.
    • Rainfall between 100-200 cm is received in the southern parts of Gujarat, east Tamil Nadu, northeastern Peninsula covering Odisha, Jharkhand, Bihar, eastern Madhya Pradesh, northern Ganga plain along the sub-Himalayas and the Cachar Valley and Manipur.
    • Western Uttar Pradesh, Delhi, Haryana, Punjab, Jammu and Kashmir, eastern Rajasthan, Gujarat, and Deccan Plateau receives rainfall between 50-100 cm.
    • Areas of Inadequate Rainfall: Parts of the Peninsula, especially in Andhra Pradesh, Karnataka and Maharashtra, Ladakh, and most of western Rajasthan receive rainfall below 50 cm.
    • The east Himalayan region of India gets high rainfall from the southwest monsoon in summer. Hence, Statement 3 is correct.

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