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Class 10 Class 12
Why do we have an appendix ?

Appendix is a vestigial organ that is found in humans, a few species of great apes. About 6 cm long and 1 cm wide, it is a hollow organ that arises from the caecum. The walls of appendix are muscular and lined with a layer of lymphoid tissue and then an innermost layer of epithelium. It is structurally similar to colon and is also capable of peristalsis. The appendix has no function ; we do not know why humans have one. Since it vaguely resembles a lymph node, the appendix may function to prevent intestinal infections.



Name the fat soluble vitamins.

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

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 are Sanguivorous animals ?

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

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 is the function of enamel in digestion?

The enamel helps in the mastication of food.