POLLINATION 
209 
This contains the protoplasm of the pollen grain, and two 
nuclei, one of which, the sperm nucleus, will join with that 
found in the ovule, the egg nucleus, to start the new plant 
formed in the seed. 
The pollen tube and the style both show adaptations. The 
style is either tubular, affording a path for the pollen tube, 
A, whole flower. Note the platform where the insect alights. 
or it is composed of cells very loosely packed, allowing the 
tube t6 pass through it readily. The adaptations of the 
tube are its ability to absorb food from the tissues through 
which it passes, and to find the micropylar opening of the 
ovule. 
