UPSC Environment Ecology Prelims National Parks

2021-08-19 21:06:26 Art And Culture Notes For Prelims Open / Comment

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2021-08-19 17:35:27 GANGETIC DOLPHIN

The Ganges river dolphin was officially discovered in 1801. Ganges river dolphins once lived in the Ganges-Brahmaputra- Meghna and Karnaphuli-Sangu river systems of Nepal, India, and Bangladesh. But the species is extinct from most of its early distribution ranges.

The Ganges river dolphin can only live in freshwater and is essentially blind. They hunt by emitting ultrasonic sounds, which bounces off of fish and other prey, enabling them to “see” an image in their mind.

Ganges river dolphins prefer deep waters, in and around the confluence of rivers.

They are classified as Endangered as per the IUCN Red List. Open / Comment

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2021-08-19 15:30:05 NOISE POLLUTION

Noise pollution is an unpleasant noise created by people or machines that can be annoying, distracting, intrusive, and/or physically painful.

Noise pollution comes from sources such as “road traffic, jet planes, garbage trucks, construction equipment, manufacturing processes, leaf blowers, and boom boxes.”

Sound is measured in decibels (dB). An increase of about 10 dB is approximately double the increase in loudness.

A person’s hearing can be damaged if exposed to noise levels over 75 dB over a prolonged period of time. The World Health Organization recommends that the sound level indoors should be less than 30 dB. Open / Comment

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2021-08-18 17:30:07 CAMPOS

The Savanna grasslands of southern Brazil are known as Campos.

The Campos are characterized by grassland and woodland.

The trees are widely spaced.

These grasslands have park like appearance.

Fire is a frequent occurrence in these grasslands.

The Campos are rich in fauna and flora and they are increasingly brought under cultivation. Open / Comment

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