3.3 Pollination

3.3b wind


Transfer of pollen from anther to stigma carried by wind
e.g plant
Adaptations:
-light weight pollen grains
-some form of wing feature
-Anthers are well clear of any flower structure (up high, exposed)
-stigma have large surface area, kind of feather like structure to catch pollen grains-also exposed
-no need for colour or sent or nectaries--no need to attract insects 


3.3a insect
Insect attractions


pollination-->transfer of pollen from the anthers to the stigma of another plant (cross pollination)
-pollen contains the male nuclei)
Insects are required to transfer the pollen, therefore the plant needs to attract the insects.
Attractions:
-Signals to the insect:
-the coloured petals
-sent
The pay off: food
-> the nectaries (produce a sugar called FRUCTOSE)
->pollen-source of protein

structure:

Male (stamen)
-Anthers and filaments
Female (carpel)
-stigma
-avary
-style