Consider the following pairs :

Layers of Atmosphere : Characteristics

I. Troposphere : Absorbs ultraviolet radiation
II. Stratosphere : Changes in weather and climate
III. Mesosphere : Reflects radio waves back to the Earth

How many of the pairs given above are correctly matched?

All three pairs are incorrectly matched. The correct associations are as follows:

• Troposphere: This is the lowest layer of the atmosphere where almost all weather and climate changes occur, as it contains most of the atmosphere's water vapor and aerosols.
• Stratosphere: This layer houses the ozone layer, which absorbs harmful ultraviolet (UV) radiation from the sun. It is generally free from weather disturbances.
• Mesosphere: This is the third layer of the atmosphere. It is the layer where most meteors burn up upon entry.
• Thermosphere (Ionosphere): The ionosphere contains electrically charged particles that reflect radio waves back to the Earth, facilitating long-distance wireless communication.

Since the characteristics for Troposphere and Stratosphere are swapped, and the characteristic for Mesosphere actually belongs to the Ionosphere, none of the pairs are correctly matched.