Short Essay On Earth Day In Urdu

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The first steps towards correctly explaining the colour of the sky were taken by John Tyndall in 1859.

He discovered that when light passes through a clear fluid holding small particles in suspension, the shorter blue wavelengths are scattered more strongly than the red.

The scattered light can also be shown to be polarised using a filter of polarised light, just as the sky appears a deeper blue through polaroid sun glasses.

This is most correctly called the Tyndall effect, but it is more commonly known to physicists as Rayleigh scattering—after Lord Rayleigh, who studied it in more detail a few years later.

It would not be long, when the number of herbivores in the forests would rise to such an extent that they would move to farmland and villages for their food needs.

Thus, saving wildlife plays a big role in controlling the ecological balance, maintaining a healthy ecosystem.

If bees are reduced in number, the growth of food crops would decrease significantly due to lack of pollination.

Similarly, if a species becomes larger, it may again have a negative effect on the ecological balance.

Crop growth can be significantly affected if the number of birds and insects carried by the pollen decreases in number for any reason.

You would be surprised to know that 90% of the world's apple production depends on the pollination of bees.

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