LIVING THINGS 



217 



the pollen grains to the receptive parts of the carpels is 

 called pollination. The colored parts of flowers, known as 

 sepals and petals, protect the other organs and assist in the 

 work of pollination by attracting bees and other insects 

 which, in their efforts to get at the nectar, are forced to 



itil 



FIG. 82. Semi-diagrammatic representation of nuclear division which occurs 

 whenever a cell divides. (Stevens.) 



brush against the stamens and so become dusted with pollen 

 to be carried to other flowers. Flowers which lack petals 

 and sepals are usually pollinated by the wind. In some 

 species of plants, the stamens are borne on one plant and 

 the carpels on another, Such species are said to be dioecious. 



