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Transcript of End Show Slide 1 of 33 Copyright Pearson Prentice Hall 22–1 Introduction to Plants.
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Slide 1 of 33
Copyright Pearson Prentice Hall
22–1 Introduction to Plants
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22–1 Introduction to Plants
Slide 2 of 33
Copyright Pearson Prentice Hall
What Is a Plant?
What Is a Plant?
Plants are multicellular eukaryotes that have cell walls made of cellulose.
Plants develop from multicellular embryos and carry out photosynthesis using the green pigments chlorophyll a and b.
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22–1 Introduction to Plants
Slide 3 of 33
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The Plant Life Cycle
Alternation of Generations
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22–1 Introduction to Plants
Slide 4 of 33
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The Plant Life Cycle
The diploid (2N) phase is called the sporophyte, or spore-producing plant.
The haploid (N) phase is called the gametophyte, or gamete-producing plant.
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22–1 Introduction to Plants
Slide 5 of 33
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What Plants Need to Survive
What Plants Need to Survive
In order to survive, plants need:
• sunlight
• water and minerals
• gas exchange
• transport of water and nutrients throughout the plant body
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22–1 Introduction to Plants
Slide 6 of 33
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Early Plants
The first plants evolved from an organism similar to the multicellular green algae living today.
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22–1 Introduction to Plants
Slide 7 of 33
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Early Plants
The oldest known plant fossils, about 450 million years old, are similar to today’s mosses.
They had a simple structure and grew close to the ground.
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22–1 Introduction to Plants
Slide 8 of 33
Overview of the Plant Kingdom
Overview of the Plant Kingdom
Plants are divided into four groups based on these features:
• water-conducting tissues
• seeds
• flowers
Plants are also classified by other features, including reproductive structures and body plan.
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22–1 Introduction to Plants
Slide 9 of 33
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Overview of the Plant Kingdom
Evolutionary Relationships Among Plants
Flowering plants
Cone-bearing plants
Ferns and their relatives
Mosses and their relatives
Flowers; Seeds enclosed in fruit
Water-conducting (vascular) tissue
Seeds
Green algae ancestor
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Slide 10 of 33
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22–1
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Slide 11 of 33
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22–1
Most plants alive today are
a. cone-bearing.
b. flowering.
c. ferns.
d. mosses.
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Slide 12 of 33
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22–1
The two phases of a plant's life cycle are referred to as
a. alternation of generations.
b. spontaneous generation.
c. biogenesis.
d. sexual and asexual.
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Slide 13 of 33
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22–1
Which statement accurately describes a way that plants meet their basic needs?
a. Plants take in carbon dioxide from soil through their roots.
b. Plants obtain the energy for photosynthesis from sunlight.
c. Plants obtain minerals by exchanging gases with the atmosphere.
d. Plants absorb water through their broad, flat leaves.
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Slide 14 of 33
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22–1
The first group of plants to evolve from green algae were the
a. cone-bearing plants.
b. ferns.
c. mosses.
d. flowering plants.
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Slide 15 of 33
The diploid phase of the plant life cycle is known as the
a. sporophyte.
b. gametophyte.
c. egg.
d. spore.
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22–1
END OF SECTION