Question

Answer the following:
1. Name the four types of teeth in human beings.
2. Cell membrane is called selectively permeable membrane. Give reason.

Answer 1

Answer:

1. 8 Incisors

4 Canines

8 Premolars

12 Molars

2. The plasma membrane is called as selectively permeable membrane because it regulates the movement of substances in and out of the cell. It means that the plasma membrane allows some material to pass through it while at the same time it blocks other material from entering through it.

Answer 2

Explanation:

1. incisors,canines,premolars,molars.

2 as it permits the movement of only certain molecules in and out of the cells.