Life Cycle of Flowering plants ANGIOSPERMS Angiosperms What

Life Cycle of Flowering plants ANGIOSPERMS

Angiosperms What is an Angiosperm? Angiosperms are flowering plants whose embryos are contained within a seed. Structure of the Flower: 1. Stamen- the male reproductive organs of the angiosperm a. Anther- is a sac-like structure where pollen grains, containing sperm cells, are produced. b. Filament- is a stalk-like structure which holds up the anther. ****A flower may contain one or many stamens.

Angiosperms (cont…. ) 2. Pistil- the female reproductive organs of the angiosperm a. Stigma- is a large, sticky knob which receives the pollen “STICKY STIGMA” b. Style- supports the stigma c. Ovary- swollen base of the pistil Thinking back to the unit on the human reproductive system, what do you think happens in the ovary of the flower? Egg cells are produced ** Within the ovary, there are several ovules (which produce the egg cells) Ovaries-----> fruit Ovules------> seed ****Most flowers contain only one pistil.

Angiosperms (cont…. ) 3. Pedicle- supports the flower and connects it to the stem of the plant. 4. Receptacle- is the expanded end of the pedicle. 5. Sepals • protect developing flowering parts as they grow • Calyx- is the name for the complete circle of sepals • Sepals may be small and green, or large and brightly colored 6. Petals- their function is to attract pollinators • Petals may be white, or brightly colored 7. Corolla- the complete circle of petals

Angiosperms (cont…. ) What is a POLLINATOR? Pollinates ***Pollination refers to the transfer of pollen from the anther to the stigma. So…. . The colorful petals help to attract animals to pollinate. What do you think a “perfect flower” is comprised of? Both pistil and stamens What, in the animal world, is the organism that is similar to the perfect flower, because it has both male and female reproductive organs? Hermaphrodites (ex. - earthworm) What do you think an imperfect flower is comprised of? It is a flower that contains either the pistil or the stamens.

What are the male and female reproductive organs of a flower? What structures are they comprised of, and what function does each structure perform? 1. Stamen-male reproductive organ • Anther- produces pollen • Filament- supports the anther 2. Pistil- female reproductive organ • Stigma- receives the pollen, how? • Style - supports stigma • Ovary- swollen base of pistil, produces eggs What are the remaining parts of the flower, what is the function of each structure? Pedicle- supports flower and connects it to the stem Receptacle- expanded end of pedicel Sepals- protects developing flowering parts as they grow (calyx) Petal- attract pollinators What is the difference between a perfect flower, and an imperfect flower? Perfect- has pistil and stamens Imperfect- has either pistil or stamens