Life Cycle of Flowering Plants

Pollination 1.Pollen grain sticks to stigma 2.Tube cell elongates and burrow into style until it reaches ovule 3.Tube cell nucleus travels down the elongated cell followed by two sperm nuclei

Pollination 4.Tube cell nucleus degenerates 5.One sperm nucleus fuses with two endosperm nuclei forming a triploid endosperm 6.One sperm nucleus fuses with the egg to form zygote

Self-Incompatibility in Flowers

Seed Development Endosperm develops into food for embryo when it germinates Basic pattern of adult plant develops in the embryo –Roots – shoots axis Apical meristem – elongation –Radial Ground meristem Protoderm – epidermal tissues Procambium – vascular

Pollinators Coevolution of plants and pollinators –Mostly insects

Lines and color guide insects to nectar

Ultra Violet light reveals what insects see Visible UV

Mimicry Flower –Orchid (Chiloglottis trapeziformis) Pollinator –Wasp (Neozeleboria cryptoides)

Flowers produce female pheromones and mimic female wasp shape

Male wasp tries to copulate with flower causing pollen to be deposited onto male wasp

Male wasp flies to another flower and deposits pollen while trying to copulate