Tag: significance of biodiversity

Environmental monitoring describes the processes and activities that need to take place to characterize and monitor the quality of the environment. It can be defined as the systematic sampling of air, water, soil and biota in order to observe and study the environment. 

Atmospheric layers include the troposphere (0 to 16 km), stratosphere (16 to 50 km), mesosphere (50 to 80km) and thermosphere (80 to 640km). In the troposphere and mesosphere, temperature generally falls with increasing altitude, while in the stratosphere and thermosphere, temperature rises with increasing altitude. In addition to temperature, other criteria can be used to define different layers in the atmosphere. 

Exosphere is the outer fringe of Earth's atmosphere, which extends some 20000 miles from the planet. It's dominant element is hydrogen and its temperature ranges from $200^0 F$ to $1000^0 F$. The lower part of exosphere contains abundance of helium besides hydrogen and is called as “helium zone”. Hence, option D is correct.

Colour of the praying mantis varies from brown to green, depending on its habitat. Colour of the body provides camouflage and enables praying mantis to blend with its environment and become invisible for both the predators and the prey.

Natural flora and fauna are the plants and animals that live in that particular area. The harmful effect of pollution such as air or water is most marked on these organisms as they are the ones who at the risk of initial exposure due to their proximity to pollutants. Thus the correct answer is option A.

5th June is World Environment Day, 22nd April is World Earth Day, 3rd September is World Ozone Day and 3rd December is World Conservation Day.

5th June every year is observed as World Environment Day. This is to ensure awareness among people for the conservation and enhancement of the environment that forms a very integral part of our ecosystem.

The United Nations (UN) International Day for the Preservation of the Ozone Layer is celebrated on September 16 every year. This event commemorates the date of the signing of the Montreal Protocol on Substances that Deplete the Ozone Layer in 1987.