Reproduction
(plants)
Diploid and Haploid cells
Gametes in flowering plants
Insect pollination
Wind pollination
- The exception are sex cells or Gametes which only have one set of chromosomes
- Most cells in organisms are diploid cells which means they have 2 matching sets of chromosomes
- Ovules contain the plant's female gametes, this is produced in the Ovary
- Wind pollinated flowers are neither colourful or scented as they dont need to attract any insects
- They have feather stigmas that hang out of the flower
- Pollen grains are spiky to stick onto pollinators
- Both the anthers and ovary are present in the flower
- Pollen grains contain the plant's male gametes, these pollen grains are produced in the Anthers
- pollination is the transfer of pollen from the anther to the stigma
- Insect pollinated flowers are colourful, scented and have very sticky Stigmas within the flower
- Pollen grains are light and streamline to blow in the wind
Fertlisation
- The zygote develops into an embryo
- In plant the zygote develops into seeds
- A zygote is prouced
- The ovary wall becomes the fruit
Process
- From the stigma the pollen grains grows a pollen tube
- which grows towards the ovary
- on reaching the ovary the tube bursts
- releases the male gamete
- once inside the gamete nuclei fuse together
- This is Fertlisation