Question

The relative humidity is often near 100 percent in the polar region.
A. True
B. False

Answer 1

Hint: We have to remember that the relative humidity (RH) is defined as ratio of the partial pressure of water vapor and equilibrium pressure of water vapor at a particular temperature. Relative humidity depends on the desired system temperature and pressure. The same amount of water vapor causes a higher relative humidity in cold air than in warm air.

Complete answer:
Let’s first understand about humidity.
We can define the Relative humidity (RH) as ratio of the partial pressure of water vapor and equilibrium pressure of water vapor at a particular temperature. Absolute and relative humidity changes with temperature.
Maximum absolute humidity near the equator and gradually decreasing as we continue our journey to the poles. Relative humidity is also maximum near the equator, but decreases in subtropical areas and increases again in temperate regions. Relative humidity is thus affected by temperature and latitude.
The temperatures in the polar region is low, and relative humidity is high there. In the polar region air is usually nearly eighty percent saturated. The water vapor content is also low in the air, the water vapor capacity is low as well. This causes the Saturation of air that is holding very small amounts of water vapor even when the air is dry relatively. As a result, the relative humidity is higher in the polar region.
Since relative humidity is maximum at poles and it decreases as we move towards the equator, the statement “The relative humidity is often near 100 percent in the polar regions” is absolutely correct.
So, the correct answer is “Option A”.

Note:
We have to know that the moisture affects (Humidity) the structure, shape and transpiration in plants. At higher temperatures, humidity is relatively low and exposed water evaporates rapidly, increasing the rate of sweating. Transpiration is one of the main functions that determine the habitat of plants. For example, the extremely humid air in lowland forests or in sheltered mountain ravines (narrow canyons between mountains) is largely responsible for the gentle and distinctly moisture-loving nature of these plants. Plants such as orchids, mosses and mosses depend on moisture for their water needs.