Transcript Document 115646

Bellringer
Gymnosperms are a vascular
plant that do have fruit or
flowers.
True or False
Seed Plants
Chapter 4 Section 3
Characteristics of Seed Plants
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Two Stage Life Cycle
Produce seeds
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Gametophytes do not live independently
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Form in sporophyte
Sperm found in pollen
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They nourish and protect young sporophyte.
Sperm do not need water to swim in to reach the
eggs
Can live almost anywhere
The Structure of Seeds
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Made of Three Parts
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Young plant
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Stored Food
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Sporophyte
Found in cotyledon
(seed leaves)
Seed Coat
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Protects the young
plant
Gymnosperms
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Do not have flowers of
fruit
Seeds are protected by
cone
Four groups
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Conifers
Ginkgoes
Cycads
Gnetophytes
Gymnosperms
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The Importance of Gymnosperms
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Economically important
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Resin
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Wood for building
Makes soap, turpentine, paint and ink
Anticancer drug
Anti-allergy drug
Gymnosperms
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Gymnosperm Life Cycle
1. Seed contains young sporophyte. Grows into an
adult sporophyte
2. Spores are produced. Grow into gametophytes.
3. Sex cells are produced in cones.
4. Wind carries pollen to egg; sperm fertilizes egg
5. Fertilized egg develops into young sporophyte
with seed
Angiosperms
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Produce flowers and
fruit
235,000 species
Found almost
anywhere
Angiosperms
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Angiosperm Reproduction
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Flowers help with reproduction
Pollination:
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Wind
Animals
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Eat and dispose
– Carry burrs with fur
Angiosperms
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Two Kinds of Angiosperms
1. Monocot
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Leaves with parallel veins
Flower parts in threes
Scattered vascular tissue
One cotyledon
Examples: grasses, orchids, lilies, palms
2. Dicot
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Leaves with branching veins
Flower in parts of fours or fives
Ring of vascular tissue
Two cotyledons
Examples: roses, cactuses, sunflowers, peanuts, peas
Angiosperms
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Importance of Angiosperms
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Food to animals
Food crops
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Building material
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Oak trees
Clothing and rope
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Corn, wheat, rice
Cotton, flax
Medicines
Rubber
Perfume/oils