Presentation on theme: "By Frank H. Osborne, Ph. D. Lab 10 - Flowers and Fruits"— Presentation transcript:
1 By Frank H. Osborne, Ph. D. Lab 10 - Flowers and Fruits Principles of BiologyByFrank H. Osborne, Ph. D.Lab 10 - Flowers and Fruits
2 Flowers A. The flower is the reproductive structure of the plant. 1. Many flowers contain both male and female reproductive parts.2. Some species of plants have only one type of flower on a plant. These species have male and female plants. An example is Holly.
4 B. Parts essential for reproduction 1. Female parts - the pistila. Ovaryi. The ovary is at the base of the pistil.ii. The ovary may have one or morechambers.iii. The ovary contains ovules which arethe unfertilized female structurescontaining the egg.
5 B. Parts essential for reproduction 1. Female parts - the pistilb. Stylei. The style is a conduit connectingthe ovary to the stigma.ii. Pollen grains travel through thestyle.
6 B. Parts essential for reproduction 1. Female parts - the pistilc. Stigmai. The stigma is found at the end of thepistil.ii. The pollen stick to the stigma thensend nuclei into the style and,through the style, to the ovary.
7 B. Parts essential for reproduction 2. Male parts - the stamensa. Antheri. The anther produces pollen whichare the male reproductive structuresof the plant.
8 B. Parts essential for reproduction 2. Male parts - the stamensa. Antherii. The pollen fertilize the ovules bybeing attached to the stigma,traveling through the style into theovary, and entering the ovules.b. The filament supports the anther.
10 C. Parts that are not essential for reproduction 1. BractThe bract is a structure that protects theimmature flower.2. Stalka. The stalk is called a pedicel.b. The top part of the pedicel is called thereceptacle. The flower is attached tothe receptacle.
11 C. Parts that are not essential for reproduction 3. Sepalsa. In many flowers, these protect theimmature flower parts while theyare developing.b. Sometimes they are green, sometimesthey are the same color as the petals.
12 C. Parts that are not essential for reproduction 3. Sepalsc. They are found outside the petals.d. There are generally three or fivesepals in a flower.
13 C. Parts that are not essential for reproduction 4. Petalsa. In many flowers, the petals arebrightly colored to attract insects.b. They are found inside the sepals.c. There are generally three or five petalsin a flower.
16 Pollination A. Pollen is produced in the anther. B. Pollen must get to the stigma in order tofertilize the flower.1. Some flowers are pollinated by the wind.An example is grass.2. Some flowers are pollinated by insects.3. Some flowers can pollinate themselves.
17 Fruit Development A. After fertilization, the ovary of the flower develops into a fruit.B. Inside the fruit, the fertilized ovules developinto the seeds.
18 Dispersal of Seeds A. Wind dispersal 1. Some plants use wind to spread their seeds.2. Their seeds are light and easily blown away.3. Examples are maple trees and dandelions.
19 B. Animal dispersal1. Acorns are the fruits of oak trees. Theacorns are buried in the ground bysquirrels.2. Animals eat fruit, such as apples, and theseeds are deposited elsewhere.