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Digestion and Absorption

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
What prevents the wall of the digestive tract from being digested ?

Wall of digestive tract is not digested because of the following reasons :

1. There is a layer of glycocalyx inner to enteric epithelium which checks the action of enzymes.

2. The protein digesting enzymes are always in inactive stage. They become active on getting mixed with other types of enzymes.

3. There is lining of mucus inner to enteric epithelium which dilutes the action of enzymes on wall of alimentary canal.

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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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What is the function of enamel in digestion?

The enamel helps in the mastication of food.
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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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