Pg 60 Angiosperm Flashcards
What is an angiosperm
Plants with flowers which produce their ovules enclosed in an ovary
What is a flower
Organ of sexual reproduction, it contains the reproductive organs and often will attract pollinators
Hermaphrodite flowers
Flowers that make both male male and female gametes
What are pollen grains produced by
Anthers
Where are the male gametes found
Inside the pollen grains
Where are female gametes found
Inside the ovules
What are the ovules enclosed by
The ovary
The female part of the flower
Carpel
Carpel
Ovary, style and stigma
What does each mature ovule contain
A female gamete
What happens once the female gamete in the ovule is fertilised by the male gamete
The ovule develops.
The ovary develops into fruit
The style: function
Holds the stigma in the most favourable position to receive pollen.
Stigma: function
Sticky part that receives pollen
Male part of the flower
The stamen
What does the stamen consist of
The anther and filament
Anther function
The structure that forms pollen grains in which the male gametes are found
Filament function
Holds the anther in the best position for pollen to be released
Cross pollination
Pollen is transferred from the anther of a flower of one plant to the stigma of a flower of another plant of the same species
What does cross pollination result in
Genetic variation
Self pollination
The pollen is transferred from the anther to the stigma o for same flower or the another flower on the same plant
What does self pollination result in
It does not result in genetic variation
Pollination
The transfer of pollen from the anther to a stigma, thereby enabling fertilisation and reproduction
Types of pollination
Self pollination and cross pollination
How can self pollination be prevented
• In bisexual flowers: the anthers and stigmas ripen at different times. Most commonly the anther ripen first
