MPPSC 2023 Prelims Paper-I · Question 56 of 100

Correct — D, Troposphere. The troposphere is the lowest layer of the atmosphere, extending from the Earth's surface up to roughly 8–18 km (lower over the poles, higher over the equator). It holds almost all of the atmosphere's water vapour, dust and cloud-forming moisture, and its temperature falls steadily with height, driving the vertical air movement that produces clouds, rain and storms. Because virtually all weather activity is confined to this layer, it is the one known for changes in climate and weather.

• (a)Thermosphere — The outermost, highest layer, home to the ionosphere; air is extremely thin here and temperature rises sharply from absorbed high-energy solar radiation — associated with auroras and satellite orbits, not weather.
• (b)Stratosphere — Lies above the troposphere and contains the ozone layer; it is stratified with little vertical mixing, making it calm and largely free of the turbulence that produces weather.
• (c)Mesosphere — The coldest atmospheric layer, above the stratosphere, where most meteors burn up on entry — too high and too thin to generate weather.

The atmosphere is divided into layers based on how temperature changes with altitude. The troposphere, the lowest and densest layer, holds about three-quarters of the atmosphere's total mass and nearly all its water vapour — the raw material for clouds and precipitation. Its temperature decreases with height, driving convection, cloud formation and storms, which makes it the layer of active 'weather.' The layers above it (stratosphere, mesosphere, thermosphere) are progressively thinner and largely free of this activity.

Exams often test 'which layer hosts weather' alongside layer-ordering or layer-property questions. The quickest anchor: troposphere = weather (clouds, rain, storms); stratosphere = ozone layer + stable flight zone; mesosphere = meteors burn up; thermosphere = ionosphere + auroras.

• Troposphere: lowest atmospheric layer, extends roughly 8–18 km above the surface
• Holds nearly all atmospheric water vapour and dust — the source of clouds, rain and storms
• Temperature decreases with altitude in the troposphere, driving vertical air movement
• Stratosphere (above it) contains the ozone layer and is comparatively calm and weather-free

• Confusing the stratosphere (ozone layer, stable) with the troposphere (weather layer)
• Assuming the outermost/highest layer (thermosphere) is the most active — it is actually the calmest for weather

Usually a direct 'which layer is responsible for weather/climate' question, or a layer-ordering/property-matching question testing the same four-layer structure.

No directly related past PYQ was found.

• practice — not a real PYQ

  The ozone layer, which absorbs harmful ultraviolet radiation, is located in which atmospheric layer?

  • (a)Troposphere
  • (b)Stratosphere
  • (c)Mesosphere
  • (d)Thermosphere

  Answer(b) Stratosphere — it houses the ozone layer and lies just above the troposphere.

• practice — not a real PYQ

  In which atmospheric layer does temperature generally decrease with increasing altitude, giving rise to convection and cloud formation?

  • (a)Troposphere
  • (b)Stratosphere
  • (c)Mesosphere
  • (d)Thermosphere

  Answer(a) Troposphere — this falling temperature with height drives the vertical air movement behind weather.