Pollination Flashcards
autogamy
within the same flower.
conditions required for autogamy
-closed flowers(cleistogamous flowers)
- synchrony in pollen release and stigma receptivity
chasmogamous flowers and examples
exposed anther and stigma. sunflower, cotton and rose
cleistogamous flowers and examples
does not open at all. pisum, groundnut
Both cleistogamous and chasmogamous flowers are present in
commelina
Disadvantage of cleistogamous flowers
No variation for evolution
Geitonogamy
between two flowers of the same plant. genetically similar to autogamy
Xenogamy
between two different plants. produces variations.
abiotic agents
wind and water
biotic agents
animals
conditions necessary for wind as a pollinating agent
non sticky pollen, well exposed stamen and large feathery stigma.
which plant uses water as an agent
monocots
which aquatic plant uses insects
waterlily
dominant pollinating agent
bees
entomophily
pollination by insects
Which of the following species provides floral rewards in the form of providing safe place to lay eggs ?
Amorphophallus, fig and yucca.
where does moth deposit their eggs to yucca
locule of the ovary
who are pollen robbers with examples
consumes pollen without bringing about pollination. example- bumble bees, ants and carpenter bees
Inbreeding depression
continued self pollination
preventions to discourage self pollination
-decrease synchrony for pollen release and stigma receptivity.
-placement for anther and stigma so they cannot come in contact.
-inhibit pollen germination
-production of unisexual flowers.
Pollen-pistil interaction
Pollen recognition + promotion or inhibition of the pollen
what is artificial hybridisation
desired pollen grain + stigma
methods of artificial hybridisation
emasculation and bagging technqiues
Emasculation
removal of anthers using forceps before dehiscence.
Bagging techniques
Stigma is covered by butter paper to prevent contamination with unwanted pollen.
is bagging done before or after the flower is open
before the flower opens
