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Digestion and Absorption

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
(a) Why are villi present in the intestine and not in stomach.

(a) Major portion of absorption of food takes place in small intestine. Absorption in small intestine is also important because digestion is almost complete by the time food reaches ileum. Villi increase the absorptive surface area for the absorption of digested food. The digested food is present in intestine only. The digested food is not present in stomach, therefore in this part there is no need of villi and thus, they are absent.
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What is the order of arrangement of teeth in each half of the upper and lower jaw ?

The order of arrangement of teeth in each half of the upper and lower jaw is I,C,PM,M.  I (incisors), C (cannine), PM (premolars), M (molars).
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Name the fat soluble vitamins.

Vit A, D, E and  are fat soluble vitamins.
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What is Diphyodont ?

Diphyodont is the condition of having two set of teeth during the life of an organism. For example : humans are diphyodont as they have two set of teeth namely temporary milk or deciduous teeth which are replaced by permanent or adult teeth. 

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What is the function of enamel in digestion?

The enamel helps in the mastication of food.
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What are Sanguivorous animals ?

The animals which suck blood e.g. leech, vampire bat, female mosquito etc.
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