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A flower isn´t an ornament or a present for someone, is the reproductive organ of plants.
Steps: 1. The pollen reaches Consists of the union the flower´s stigma. of the male & female Forms the pollen parts tube, which grows along the style until 2. The male gamete it reaches the goes down inside its ovary pollen tube to the ovary where the female gamete can be found 3. The male gamete & the female gamete join. Fertilisation takes place and the zygote is formed http://www.youtube.com/watch?v=FsBQQDg5GIw
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The zygote develops & the seed is formed. Has 3 parts:
The radicle
The embryo:
Small root
Produced in the zygote
The hypocotyl
Tiny version of the future plant 3 parts
Small stem The cotyledon
Leaves
Endosperm: Is nutritious substance that envelops and feeds the embryo
Seed coat: Envelops the seed & protects it
It is formed around the seed in angiosperms After ferstilisation, the flower loses: Sepals Petals Stamens Style Stigma The fruit´s function is to protect the seed and help it in its dispersion
The seed can by dispersed by: The wind The water The animals Etc If the environment conditions are favourable, the germination can take place
Steps: 1. Seed absorbs water 2. Causes its coat to break 3. Seed opens 4. Embryo begins to develop 5. Creating a new plant ď ˝
The male part...
Has 1 part & has pollen grains
Has 2 parts and contains seeds
Has 2 parts and hasn´t contain pollen grains
Has 2 parts & contains pollan grains
Entomogamous
Anemogamous
Gantemogamous
Zoogamous
Consists of the union of the male & female parts
Consists of taking substances from the environment Consists of the union of pollen and water Consists of the germination of the seed
6 parts
1.000 parts
3 parts
5 parts
19 parts
1 parts
2 parts
After germination
During fertilisation
After fertlisitation
During germination
Dry & Old
Huge & Small
Fleshy & Old
Dry & Fleshy
In any place
Never will occur germination
Only in forests
If the environment has good condotions
Bibliography: Natural Science Anaya Class Book Natural Science Bruño Class Book