Question
What are villi? What is their location and function?
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Answer
Villi are tiny finger-like projections originating from the walls of the small intestine. They increase the surface area for absorption of the digested food. The blood vessels present inside the villi can absorb the nutrients from the digested food. 
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Q.1. The periscope works on the principle of:
(a) Refraction$\quad$(b) Reflection
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