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Digestion and Absorption

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
What are disadvantage of incomplete alimentary canal ? And also discuss the advantage of complete alimentary canal.

Complete alimentary cycle : In this, mouth and anus or clocal aperture are present. E.g. from Nematodes to Chordates

Incomplete alimentary cycle : In this, only ore opening i.e. mouth is present. E.g. flatworms

Disadvantage of incomplete alimentary canal.

1. Waste food must be expelled before taking the next food, otherwise there would be mixing of both.

2. The incomplete digestive tract cannot store the food.

3. It is less efficient because it serves as the function of circulatory system.

Advantage of complete alimentary canal.

1. There is no chance of mixing in digested food and waste food, because the opening for ingestion and egestion are separate.

2. For circulation of absorbed food there is circulatory system.

3. It is more efficient. 


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. 


What is the function of enamel in digestion?

The enamel helps in the mastication of food.

Name the fat soluble vitamins.

Vit A, D, E and  are fat soluble vitamins.

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).

What are Sanguivorous animals ?

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