Pollination is the transfer of pollen grains from the anthers to the stigma. It is a necessary process in the life of a plant because it is the very trigger of reproduction in the group of plants we are studying. That is, flowering plants. Somehow, the male gametes have to make it to the female ones in order for reproduction to occur, and this is the process by which this occurs.
There are two main ways in which pollination can occur and these are:
It is favoured in some flowers by adaptations within the flower itself.
For example, some flowers have the stigma growing against the anthers
such that pollen naturally transfers from one to the other.
|It is encouraged in most plants,
as said earlier by such mechanisms as these:
-In some flowers the stamens ripens first and shades its pollen before the stigma mature. In such flowers the stigmas do not ripen until the stamen have withered for example protogy.
-In protogeny the carpels ripen before the stamen.
-In unisexual flowers (staminates) or (pistilates) cross-pollination is inevitable.
-Another mechanism is Heterostyly;
This is where some flowers (pins) possess long pistils and short stamens, while others (thrums) possess the opposite.
Cross pollination is encouraged because nature, it is thought, would rather have a mixture of gene material sent down to the off-spring .this favours adaptation and evolution.
Differences between wind pollinated and insect pollinated flowers.
All in all without pollination there would be no reproduction and thus no plants.
After pollination comes fertilisation.
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