question_answer 19)

  Different cells have different sizes. Arrange the following cells in an ascending order of their size. Choose the correct option among the followings. I. Mycoplasma                    II. Ostrich eggs III. Human RBC                    IV. Bacteria (a) I, IV, III, II                        (b) I, II, III, IV                    (c) II, I,III, IV                        (d) III, II, I, IV

Answer:

                  (a). Represents the correct ascending order of cell's size. Cells in organism vary greatly in their size, shapes and activities. I. Mycoplasmas are the smallest cell with size only 0.3 mm. II. Bacterial cell are of size 30-5 p,m. III. In human red blood cells are of about 7.0 p-m in diameter. IV. Ostrich eggs are among the largest cells with size (15 x 13) cm. Mycoplasma Like Organisms (MLOs) or mycoplasma are the smallest cell followed bythe size of bacterial cell, then RBCs and ostrich egg cell is the largest known cell.