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Classification of Angiosperms

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Presentation on theme: "Classification of Angiosperms"— Presentation transcript:

1 Classification of Angiosperms
The Flowering Plants

2 Two Major Groups Monocots Dicots Single cotyledon Parallel veins
Flowers in multiples of 3’s Dicots Two cotyledons Netted veins Flowers in multiples of 2, 4 or 5

3 Monocot and Dicot plant

4 FRUITS SIMPLE AGGREGRATE MULTIPLE Dry (poppy seed, milkweed, wheat)
Fleshy (peach, plumb, apple, tomato, grape) AGGREGRATE Flowers with several carpels Raspberry, strawberry MULTIPLE Cluster of flowers Pineapple

5 Simple, aggregrate and multiple fruit

6 SEED STRUCTURES Micropyle Plumule Hypocotyl
Opening through which the pollen tube grows to deliver pollen to the ovary (ovules) Plumule Epicotyl + embryonic leaves First leaves to emerge during germination Hypocotyl Stem like area between radicle and cotyledon

7 SEED STRUCTURES (2) Radicle Cotyledon Hilum Seed Coat Embryonic root
First to emerge from the seed during germination Cotyledon Fleshy part of the seed; food storage for plant embryo until germination Hilum Seed scar; where seed was attached to the ovary wall Seed Coat Covers and protects the seed during dormancy

8 Typical Seed

9 Germination Dormancy How do you know germination has occurred? Leaves
Allows seed to germinate when conditions are favorable How do you know germination has occurred? Radicle emerges Leaves Photosynthesis begins Cotyledons no longer needed

10 Factors that Trigger Germination
Water Oxygen Temperature Light Fire Freezing temps. Animal digestive tract Hormones

11 Plant Hormones Auxins Regulate plant growth

12 Hormones (2) Cytokinins Gibberellins Abscisic Acid Ethylene
Promotes cell division (roots and stems) Gibberellins Promote growth Stimulate germination Abscisic Acid Inhibits growth of buds and germination Ethylene Gas that stimulates ripening of fruits

13 Hormones (3) Oligosaccharins Regulate growth and development
Defense against disease

14 TROPISM Plant movement towards or away from a stimuli EXAMPLES
Phototropism (light) Thigmotropism (touch) Gravitropism (gravity) Chemotropism (chemical/hormones) Hydrotropism (water)

15 THE FLOWER The reproductive structure for the flowering plant
Perfect Flowers Both stamens and carpels present Self or cross pollination Imperfect Flowers Either stamens or carpels present Cross pollination only

16 Female Reproductive Parts
Essential Carpel Pistil (fused carpels) Stigma, style, ovary Stigma Sticky to trap pollen Style Tube from stigma to ovary Ovary Holds the ovules

17 Female Flower Parts C A R P E L

18 Male Reproductive Parts
Essential Stamen Male reproductive part Anther and filament Anther Produces pollen Filament Supports the anther

19 Male Flower Parts

20 Nonessential Flower Parts
Petal Attract pollinators Top whorl Sepal Protect developing flower Bottom whorl Corolla Both whorls

21 Nonessential Flower Parts

22 Flowers

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