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7.4: Plant Classification

Difficulty Level: At Grade Created by: CK-12
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Do all plants grow from seeds?

No, there are actually a few plants that do not make seeds. Whether or not a plant makes seeds is one criteria used to classify plants. How else could you distinguish between plants?

Plant Classification

Plants are formally divided into 12 phyla (plural for phylum), and these phyla are gathered into four groups ( Figure below ). These four groups are based on the evolutionary history of significant features in plants:

  1. Nonvascular plants evolved first. They are distinct from the algae because they keep the embryo inside of the reproductive structure after fertilization. These plants do not have vascular tissue, xylem or phloem, to transport nutrients, water, and food. Examples include mosses, liverworts, and hornworts.
  2. Seedless vascular plants evolved to have vascular tissue after the nonvascular plants but do not have seeds. Examples include the ferns, whisk ferns, club mosses, and horsetails.
  3. Gymnosperms evolved to have seeds but do not have flowers. Examples of gymnosperms include the Redwood, Fir, and Cypress trees.
  4. Flowering plants, or angiosperms , evolved to have vascular tissue, seeds, and flowers. Examples of angiosperms include magnolia trees, roses, tulips, and tomatoes.

Diversity of plants in the plant kingdom

The plant kingdom contains a diversity of organisms.

Summary

  • Nonvascular plants were the first plants to evolve and do not have vascular tissue.
  • Seedless vascular plants have vascular tissue but do not have seeds.
  • Gymnosperms have seeds but do not have flowers.
  • Angiosperms have vascular tissue, seeds, and flowers.

Explore More

Use the resource below to answer the questions that follow.

  1. What plant groups are included in non-vascular plants
  2. Give an example of a seedless vascular plant.
  3. What groups of plants have seeds?
  4. What groups of plants have fruit?
  5. Where do you usually find non-vascular plants? Why?

Review

  1. What distinguishes the gymnosperms from other plants?
  2. What were the first types of plants to evolve?
  3. List the following major features of plants in the order they evolved: seeds, vascular tissue, flowers.
  4. Give two examples of seedless vascular plants.
  5. Give two examples of angiosperms.

Vocabulary

angiosperm

angiosperm

Flowering plant with vascular tissue, seeds, and flowers.
gymnosperm

gymnosperm

Plant with vascular tissue and seeds but no flowers.
nonvascular plant

nonvascular plant

Plant without vascular tissue.
seedless vascular plant

seedless vascular plant

Plant with vascular tissue but no seeds or flowers.

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Description

Difficulty Level:

At Grade

Grades:

7 , 8

Date Created:

Nov 29, 2012

Last Modified:

Mar 06, 2015
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