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The given figure shows hydrophonic/soil ...

The given figure shows hydrophonic/soil less plant production. Plants are grown in a tube or through placed on a slight incline. The arrows indicate the direction of flow of nutrient solution.
Nutrient solution is sent to the elevated end of the tube from the reservoir by __________ and it flows back into reservoir due to __________

A

Pump, Gravity

B

Gravity, Pump

C

Gravity, Gravity

D

Pump, Pump

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