Reproduction in Flowering Plants
Sexual reproductive structure
Produces egg and sperm
Fertilization takes place inside the flower
*Stigma –top of the pistil,
Sticky surface for pollen to stick to
*Style – connects the stigma to the ovary
*Ovary –contains ovules
*Anther – produces sperm nuclei by meiosis. Sperm nuclei are enclosed by pollen grains.
*Filament – holds the anther up
Female reproductive organ
Male reproductive organ
Transfer of mature pollen grains from the anther to the stigma
-birds & other animals
When a pollen grain lands on the stigma, it germinates and a pollen tube grows down through the style to an ovule (egg)
The sperm travels through the pollen tube to the ovule. The sperm & egg fuse forming the zygote (fertilized egg) –this grows into the plant embryo (cells grow by mitosis)
*Self pollination –pollen from same flower *Cross pollination – pollen from a different flower - more variation
The ovary and zygote (fertilized ovule) develop and ripen.
*The ovule forms the seed and the ovary forms the fruit.
A fruit is a ripened ovary
The plant embryo uses food stored in the cotyledon of the seed until it develops leaves for photosynthesis
Epicotyl – grows above the cotyledons and gives rise to the leaves.
Hypocotyl –below the point of attachment of the cotyledon, develops into the stem.