Question

pls tell me the answer of 39 and 40

Answer 1

39. The plant cells have an layer around the cell membrane known as cell wall. It gives the cell it's shape and rigidity. It gives rigidity because it has high content of cellulose.

40.The cells present in the organisms are of ‘different shapes’ and are involved in different functions. The common phenomenon is that a group of cell forms tissues, group of tissues forms the organs and group of organs forms the organ system and it in turn forms the entire body.

For example when we compare the Red blood cells (RBC) of human as well as elephant it remains in same shape as well as in same size. It is not big in elephant and not small in human.