Question

Mesosphere is component of
A. Atmosphere
B. Hydrosphere
C. Lithosphere
D. Both A and B

Answer 1

Hint: Mesosphere is one of the five layers of the blanket of air surrounding the Earth. The Mesosphere is found above the stratosphere and below the thermosphere which extends from 50 to 85 km above the planet.

Complete answer:
The Exosphere, Thermosphere, Mesosphere, Stratosphere and Troposphere are the five main layers of the Earth's atmosphere. Mesosphere is the third layer of the atmosphere, it is above the stratosphere and below the thermosphere. It extends from 50 to 85 km above the planet and temperature decreases with increasing height and it is because of decreasing absorption of solar radiation.
If we look at options, option A is Atmosphere. It is the correct option since the atmosphere is divided into five main layers and the mesosphere is one of the five layers of atmosphere. Therefore, this is the correct option.

Moving to option B which is hydrosphere. It is the total amount of water present on the surface of the planet, underground water and in the air. Liquid water exists on the surface of earth in the form of oceans, lakes and rivers. Parts of hydrosphere are Lake, seawater, ocean current, earth, ocean, etc. Mesosphere is not a component of hydrosphere but it is a component of the atmosphere and therefore this option is incorrect and it gets eliminated.
Moving to option C which is a lithosphere which is a rocky outer part of the earth made up of bristle crust and top part of the upper mantle. The Mesosphere is not part of the lithosphere but it is a component of the atmosphere so this option is incorrect and it gets eliminated.
Last option D is Both A and B. Since mesosphere is only the component of atmosphere not hydrosphere, therefore this answer cannot be the correct one and it gets eliminated.

Thus, the correct answer is option A which is Atmosphere.

Note: Mesosphere is the third layer of atmosphere and sometimes stratosphere and mesosphere are collectively known as middle atmosphere since these two layers are middle layers of the atmosphere. In the mesosphere, gravity-wave amplitudes can become so large that the wave becomes unstable.