Classification of Plants

The Plant Life Cycle

•A plant alternates between 2 adult phases during its lifetime. The SPOROPHYTE or diploid phase (2n) is usually larger and is what you see when you look at most plants.

•Diploid = full number of chromosomes

•In humans, our diploid number is. . . .

•46

http://aggie-horticulture.tamu.edu/wildseed/flowers/ShowyPrimrose.jpg

The Plant Life Cycle

•The GAMETOPHYTE or haploid phase (n) is the dominant phase in mosses. In most other plants it is very small and is actually part of the sporophyte plant.

•Haploid = half the normal number of chromosomes

•In humans, our haploid number is. . .

•23.

Gametophyte

Sporophyte

Phylum Bryophyta—Non Vascular Plants

Examples: Mosses,

Liverworts and

Hornworts

Liverwort

Hornwort

Phylum Bryophyta•1. Life Cycle: GAMETOPHYTE is the dominant form

•2. Reproduction occurs in WATER; must live in WET environments

Phylum Bryophyta

•3. No vascular tissue (transport system for water and nutrients); no true ROOTS, STEMS or LEAVES. Obtain water through OSMOSIS

•4. Less than a few CM tall.

Phylum PteridophytaSimple Vascular Plants

Examples: Ferns and Horsetails

Phylum Pteridophyta•1. Life Cycle: SPOROPHYTE is the dominant form

•2. Contain VASCULAR tissue—plants can become LARGER and more complex

•3. True ROOTS, STEMS and LEAVES

•4. Sexual reproduction requires water for the SPERM to swim to the EGG

Phylum Pteridophyta

The remaining 2 phyla are called seed plants because

they use seeds for reproduction

POLLEN

• Seed plants store SPERM in POLLEN.

• How does pollen travel?• How is this different from the

non-vascular and simple vascular plants?

Phylum ConiferophytaGymnosperms (Cone Bearers)

Examples: Pine Tree,

Cedar

Phylum Coniferophyta•1. Life Cycle: SPOROPHYTE is the dominant form

•2. Contain VASCULAR tissue

•3. Reproduction depends on SEEDS that are stored in CONES.

•4. Leaves are NEEDLE LIKE

Phylum Coniferophyta

Phylum AnthophytaAngiosperms

(Flowering Plants)Examples: Wildflowers, Oak Tree

Phylum Anthophyta•1. Life Cycle: SPOROPHYTE is the dominant form

•2. Contain VASCULAR tissue

•3. Have FLOWERS that aid in reproduction and have allowed them to spread to almost every BIOME

•4. Leaves are BROAD and FLAT

Phylum Anthophyta

•5. There are 2 groups: MONOCOTS and DICOTS.

•Monocot = 1 seed leaf•Dicot = 2 seed leaves

Phylum Anthophyta

The leaves of monocots

have parallel veins

The leaves of

dicots have net

or branched

veins

Which Phylum?

Which Phylum?

Which Phylum?

Which Phylum?

Which Phylum?

NAME THAT PLANT• Identify each of the following as

a:– Non-Vascular Plant– Simple Vascular Plant– Gymnosperm– Angiosperm

• If it is an angiosperm, also identify it as a monocot or dicot.

Peat Moss

FERN

POST OAK TREE

CEDAR

BLUEBONNET

LILY

JUNIPER