Page 136 - Ripples SCIENCE 7 - TEJPUR Edition 2024 Answer Key

5. Explain the structure of a cyclone.

Ans. Structure of a cyclone
The parts of a tropical cyclone are the rain bands,

the eye and the eye wall. The centre of the cyclone
is a clean area where there are no clouds but only

light winds. This area ranges from 10 to 30 km
in diameter. This region lies around this eye and

has a diameter of around 150 km. This region
has high-speed winds of 150 to 250 km per hour

accompanied by heavy rainfall. The first indication of a cyclone can be observed
when strong winds start flowing and pushing away water from the shores.

6. What happens when land and water unevenly heated?
Ans. Effects of Uneven Heating:

• Sea Breeze and Land Breeze: During the day, land heats up faster than water,
causing air over the land to rise and be replaced by cooler air from over the

water (sea breeze). At night, the reverse happens; land cools faster than water,
and the cooler air from the land moves to replace the warmer air over the

water (land breeze).
• Pressure Differences: Uneven heating creates differences in air pressure,

leading to wind patterns and local weather changes.
• Monsoon Winds: Seasonal variations in heating of land and water lead to

monsoon winds, which bring heavy rains essential for agriculture.
• Cyclones: The difference in temperature and pressure between land and water

can also contribute to the formation and intensification of cyclones and other
weather systems.

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