Aditya was hanging upside down on a tree and trying to eat a mango. He was surprised that he could eat the food by defying gravity and wondered what is wrong with his body. Which of the below phenomenon is responsible for this behaviour?

Osmosis

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Peristalsis

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Regurgitation

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Reverse osmosis

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Solution

The correct option is B Peristalsis
The food moves through the digestive tract due to repeated contractions and relaxations that occur throughout the oesophagus. The contractions and relaxations move the food forward and into the digestive system. This is called peristalsis and is not dependent on the gravitaional force of the Earth.

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Newton's Reservations:
While Newton was able to formulate his law of gravity, he was deeply uncomfortable with the notion of "action at a distance" which his equations implied. In 1692, in his third letter to Bentley, he wrote: "That one body may act upon another at a distance through a vacuum without the mediation of anything else”. He never, in his words, "assigned the cause of this power". In all other cases, he used the phenomenon of motion to explain the origin of various forces acting on bodies, but in the case of gravity, he was unable to experimentally identify the motion that produces the force of gravity. Moreover, he refused to even offer a hypothesis as to the cause of this force on grounds that to do so was contrary to sound science. He commented that gravity is fundamental to all the "phenomena of nature". These fundamental phenomena are still under investigation.

Which of the given options can be inferred from the above paragraph?

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