Kategoriak: All - pollination - fertilisation

arabera Jia Jie Gan 12 years ago

264

Biology

The reproductive process in plants involves several key stages and components. Pollination is fundamental, occurring either through self-pollination, where pollen grains transfer to the stigma of the same flower or different flowers on the same plant, or cross-pollination, where pollen grains transfer to different plants of the same species.

Biology

Reproduction of plants

Dispersion

Mechanical
Split lines Dry
Water
Buoyant Hard outer cover Water resistant
Wind
Light Flat Winged Small
animals
Fleshy Succulent Sweet Brightly coloured Scented

Pollination

Ways of pollination
Wind-polliantion
Insect-pollination
Cross-pollination
pollen grains are transferred to the stigma of a different flower on a different plant of the same species.
Self-polliantion
pollen grains are transferred to the stigma of the same flower or a different flower on the same plant.

Post-fertilisation

After successful pollination, - the ovule develops into the seed - the ovary develops into the fruit

x

Stamen
Filament

Holds anther in optimal position to release pollen grain

Anther

produces pollen grain split open to release matured pollen grains

Carpel
Stigma

secretes sugary fluids to stimulate growth of pollen grain

Style

holds stigma in optimal position for pollination

Ovary

contains one or more ovules

Sepals
Protects the other parts of the flower during the bud stage