Structure/pollen Flashcards
What does the tapetum do?
Provides nutrients for pollen grain development
What is the outer layer of tissue called?
Epidermis
What is in the middle of the anther?
Vascular bundle (xylem and phloem)
What does the anther do?
Male reproductive organ
What does the filament do?
Carries H2O and nutrients to the anther
What do ovaries do?
Produce female gametes
What does stigma do?
Sticky surface that pollen grains land on during pollination
How do insect pollinated plants attract insects?
Scent, coloured flowers, large
What is the stigma like in a wind pollinated flower? Why?
Feathery, increases SA and allows pollen to attach easier
What are the anthers exposed to in wind pollinated flowers and why?
The wind to allow pollen to be blown away
How does the pollen differentiate between wind and insect flowers?
Insect - small quantity, sticky and spikey to stick to insects
Wind - large quantities, small and light to stay in air longer
What is pollination?
Transfer of pollen from one anther to stigma
What is self-pollination?
Where pollen from same plant lands on stigma
What are the advantages to self-pollination?
Rapid, high chance of success
Genes are conserved as from same plant
What are the disadvantages to self-pollination.
Reduced genetic variation
All susceptible to same disease as can’t adapt
