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Plant Diversity
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Plant Diversity

Plant Diversity

Adapted from Prentice Hall

Slide 2

What are Plants?

What are Plants?

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

Slide 3

Plant Life Cycle

Plant Life Cycle

Plants go through Alternation of Generations

Slide 4

The Plant Life Cycle

The Plant Life Cycle

During the two phases of the life cycle, mitosis and meiosis alternate to produce the two types of reproductive cells gametes and spores.

The diploid (2N) phase is called the sporophyte, or spore-producing plant.

The haploid (N) phase is called the gametophyte, or gamete-producing plant.

Slide 5

What Plants Need to Survive

What Plants Need to Survive

In order to survive, plants need:

sunlight

water and minerals

gas exchange (need CO2 & give off O2)

transport of water and nutrients throughout the plant body

Slide 6

Early Plants

Early Plants

The first plants evolved from an organism similar to the multicellular green algae living today.

Slide 7

Early Plants

Early Plants

The oldest known plant fossils, about 450 million years old, are similar to todays mosses.

They had a simple structure and grew close to the ground.

Slide 8

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.

Slide 9

Evolution of the Plant Kingdom

Evolution of the Plant Kingdom

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

Slide 10

Bryophytes

Bryophytes

Moss & Fern

Slide 11

Groups of Bryophytes

Groups of Bryophytes

Mosses and their relatives are called bryophytes, or nonvascular plants.

They do not have vascular tissues, or specialized tissues that conduct water and nutrients.

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