1. Plant Classes and Life Cycles
Plant Science

2. Classification of Plants
Four Major Groups
gymnosperms
angiosperms
mosses
ferns

3. Gymnosperms plants that produce seeds not protected by fruit
means "naked seed" in Greek
examples:
pines, firs, spruces
redwood
ginkgo

4. Angiosperms
plants that flower and produce seeds protected by fruit or pods
means "covered seed" or "enclosed seed" in Greek
made up of two classes:
monocotyledons (a.k.a. "monocots")
dicotyledons (a.k.a. "dicots")

5. Characteristics of Moncots
seeds have one cotyledon
seedlings have one seed leaf
vascular bundles are scattered
leaves have parallel veins
flower parts are in multiples of 3

6. Characteristics of Dicots
seeds have two cotyledons
seedlings have two seed leaves
vascular bundles are arranged in a circle
leaves have netted veins
flower parts are in multiples of 4 or 5

7. Plant Taxonomy
Scientific naming system used today is called binomial nomenclature
developed by Linnaeus; names are in Latin and written in italics
the first name is the genus
the second name is the species
species can be further subdivided into varieties

8. Life Cycles of Plants Three Major Groups annuals biennials perennials

9. Annuals plants that complete their life cycle in one year examples:
tomatoes
marigolds
pansies

10. Biennials plants that complete their life cycle in two growing seasons
examples:
hollyhock
parsley

11. Perennials plants that produce for more than two years
divided into two classes:
herbaceous
woody

12. Two Classes of Perennials
herbaceous: plants that have soft stems that are killed by frost
perennials: have stems and buds that can survive winter frost (trees for example)

13. Thank you for learning with us!