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Plant Classification

Plant Classification

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Plant Classification

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  1. Plant Classification AP Biology Unit 5

  2. Plant Diversity • All plants are thought to have evolved from ancestral green algae • Within the plant kingdom, there are many different types

  3. Algae– NOT a plant! • Algae is a multicellular protist • Green algae has many characteristics in common with plants, but also some distinguishing characteristics

  4. Land versus Water Plants • What are the advantages of being a water plant? • More access to water • More support (from the surrounding water) • Water helps disperse gametes Image taken without permission from http://www.blupete.com/Nature/PictureFlowers/WaterLilyPink2.jpg

  5. Land Plants • What are the advantages of being a land plant? • High concentrations of CO2 in air (compared to water) • More access to sunlight • Initially: less competition for resources, fewer predators

  6. Nonvascular vs. Vascular • Land plants can be classified as vascular or nonvascular • Nonvascular (Nontracheophyte) = no xylem or phloem • Vascular (Tracheophyte) = has a xylem and phloem

  7. Nonvascular Plants • No internal transport system • Smaller in size • Grow in large, dense mats • Have rhizoids = structures that help anchor the plant into the ground • Ex. Mosses, Liverworts, Hornworts

  8. Question… • Why can’t nonvascular plants be very tall? • Without xylem and phloem, they are unable to transport water and nutrients efficiently throughout the plant  can’t grow as tall since they can’t get the water up very high.

  9. Vascular Plants • Vascular tissue used to transport water, minerals, sugar, hormones • Have the potential to grow taller • Can be further divided into seed and nonseed plants • Ex. Ferns, conifers, flowering plants

  10. Vascular Plants- Nonseed plants • Pterophytes (Ferns) • Have a xylem and phloem • Do not have seeds to protect plant embryo

  11. Vascular Plants- Seed plants • Gymnosperms (Conifers) • Seed is not protected by fruit • Has cones • Angiosperms (Flowering Plants) • Seed is further protected by a fruit • Has flowers