EQ: How do flowering plants reproduce? Plant Physiology Plant Reproduction EQ: How do flowering plants reproduce?

Flowers Flowers are the reproductive structure of flowering plants. They protect gametes and fertilized eggs. Many parts make up the flower: Sepal: modified leaves that protect the developing flower. Petal: Modified leaves that are bright in color to attract animal pollinators.

Flowers Flower Parts cont’d: Stamen: Male structure of flower. Includes the anther and the filament. Anther – Produce pollen grains (sperm) Filament – supports the anther.

How can you remember the male vs. female parts? Flowers Flower Parts cont’d: Pistil (or carpel): Female structure of the flower. Includes the stigma, style and ovary. Stigma- covered with sticky substance to hold pollen grains when they land. Style- a tube that leads from stigma to ovary. Ovary- Base of flower where the egg is produced. How can you remember the male vs. female parts?

Plant Reproduction Flowering plants reproduce sexually There must be sperm and an egg Pollination The transfer of pollen grains from the anther (male) to the stigma (female) of a flower Pollen grains can be transferred within the same flower by pollinators

Flower Pollination & Fertilization Fertilization – joining of male and female reproductive cells. When a pollen grain lands on the surface of a stigma, it produces a tube The inside of the tube contains the male cells of the flower. The tubes grow down the style to reach the ovules in the ovary. Inside each ovule is an egg cell.

What did the male stamen say to the female pistil? I like your “Style”

Stop and Think question #1 How are the functions of the pistil and the stamen related?

Fruits A fruit is the mature ovary of a flower. It surrounds and protects the seed or seeds Play an important role in seed dispersal. Blown in the wind – ex. Dandelion By animals ex. Stuck in animals fur or deposited after digestion Movement by water Can come in many forms

Stop and think question #2 Why are fruits and seeds important adaptations for plants?

Cones Cones are reproductive structures of plants that do not bear fruit. Cones contain hard protective scales Can be Male or Female: Male cones contain pollen (sperm). Eggs are produced in female cones. Seeds also develop on the scales of female cones.

Stop and Think question #3 How can a tree which is rooted in place produce offspring with another tree hundreds of miles away?

Plant Parts and Their Function Leaves_________________________ Stems__________________________ Roots___________________________ Flower:____________________________ Photosynthesis Transport Materials Absorb Water Reproduction

Investigations Flower Dissection Each group will: Dissect a flower and sketch it, labeling all the parts. Observe pollen grains and make a labeled drawing. Observe a pistil, which has been dissected, and make a labeled drawing of the ovary. After you finish, start working on your study guide for your unit 2 test!

Exit ticket Clear your desk