12 
THE GARDEN OF THE WORLD 
These one-celled plants grow by dividing the 
cell into two or more parts. A wall will grow 
through the center of the cell, dividing the liv- 
Another cell is formed by a wall that divides the 
original cell into two parts 
ing part into two pieces. When the wall is 
finished, the cell will split in two and each part 
is then a complete cell ready to carry on the 
work of the plant. 
These one-celled plants are green. This is 
important because it means that each cell 
contains a substance called chlorophyll (pro¬ 
nounced klo'ro-fil). All plants which contain 
chlorophyll are able to manufacture food for 
themselves. The cell can take carbon dioxide 
