Question

3. What are villi? Where are villi located? What is the function of villi?
1. What is alimentary canal? Name the various parts of alimentary canal and their associated glands.
II. Answer the following questions in short:
2. Why human beings cannot digest cellulose? Explain giving reason.
4. How many sets of teeth does a human have during his life time?
5. Describe the process of nutrition in Amoeba.​

Answer 1

Answer:

1 ans. Villi are small finger-like projections found inside the inner walls of the small intestine. They v increase the surface area for absorption of the digested food. ... The surface of the villi absorbs the digested food materials.

Answer 2

Villi are small finger like projections present in the small intestine that absorb nutrients from the food you eat and then shuttle those nutrients into your bloodstream so they can travel where they're needed.
Alimentary canal is the tract from the mouth to the anus which includes all the organs of the digestive system in humans and other animals. Food taken in through the mouth is digested to extract nutrients and absorb energy, and the waste is expelled.
Humans cannot digest cellulose because they lack the enzymes essential for breaking the beta-acetyl linkages.
Humans have 20 primary teeth and 32 secondary (permanent) teeth during their lifetime.
When the Ameoba senses the food, it moves two pseudopodia towards it and they then enclose the food and form a food vacuole which digests the food with enzymes present. The waste is expelled by contractile vacuole.
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