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Plant Reproduction.

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Presentation on theme: "Plant Reproduction."— Presentation transcript:

1 Plant Reproduction

2 Sexual Reproduction of Angiosperms
Adaptations of flowers to insure successful reproduction: Bright Colors Scent Shape and Sizes

3 WHY?!? Attract animal pollinators

4 Angiosperms… Flowers that are not bright in color, smell good, or good in shape and size rely on: Wind Water Indirect Pollination Self Pollination

5 Parts of a Flower 1. Sepals 2. Petals 3. Stamen 4. Carpels

6 Parts of a flower Petal (Carpels)

7 Parts of a Flower Sepal-outer most ring protect the petals when the flower is developing

8 Parts of a Flower Petals- 2nd ring in, job is to attract pollinators, size and shape, and fragrance.

9 Parts of a Flower-Stamen
Stamen-3rd ring in, is the male reproductive structure.

10 Parts of a Flower-Stamen
Anther: pollen structures that develop into pollen grains. Filament: supports the anther, stalk-like

11 Parts of a Flower-Carpels
Carpels- inner most ring, female reproductive structure. (Carpels)

12 Parts of a Flower-Carpels
-Pistil- 2 or more carpels fused together A. Stigma- top part of the pistil tip of style, contains hairs to attract pollen grains B. Style-Stalk-like, raises up from ovary where pollen tubes are created C. Ovary-large base of pistil, ovules are found inside (female sex cells)

13 Parts of a Flower-Carpels

14 Flower Facts Most flowers=hermaphrodites Some=only 1 sex organ
Annual= plant every year Perennials= come back each year

15 Plant Reproduction **See Figure 32-9 Pg. 633**
Ovules- form in ovary of pistil Pollen Grains- form in anther of stamen

16 Pollen Grains

17 Pollination Transfer of pollen from the anther to the egg in the ovary thru many methods

18 Double Fertilization Step 1: Sperm #1 Union of gametes
1n pollen + 1n ovule= 2n zygote Zygote goes through mitosis to create the embryo Step 1: Sperm #1

19 Double Fertilization Step 2: Sperm #2
1n pollen + 2 polar nuclei = 3n endosperm endosperm for nourishment for embryo used up by embryo as seeds mature

20 Fruit Mature ovary Made up of maternal tissue Purpose
Protect seeds and aid in dispersal If too close together compete to survive Delays sprouting until correct conditions are available

21 Types of Fruit 1. Simple Single ovary from a single flower formed from 1 pistil of 1 flower Ex. Dry vs. Fleshy Peas, corn, wheat, cherry, apple, tomato

22 Types of Fruit 2. Aggregate
Formed from several pistils of a single flower Ex. Raspberry and Strawberry

23 Types of Fruit 3. Multiple
Formed from several flowers growing together Ex. Pineapples and Figs

24 Parts of a Fruit (Pit) (Flesh) (Skin)

25 Fruit and Seed Dispersal
Wind Orchids= dust like seeds Dandelions= parachutes

26 Fruit and Seed Dispersal
Animal Seeds pass unharmed thru digestive tract (Feces + New Spot) Carry seeds or fruit on or in them

27 Fruit and Seed Dispersal
Water Seeds or fruits contain air chambers that allow them to float Ex. Coconut

28 Fruit and Seed Dispersal
Gravity Male cones on top facing down, female facing up Sperm falls from seeds, cone fall off and roll away

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