EVOLUTION AND DIVERSITY OF THE PLANTS

Nota:

• FOUR MAIN PARTS

1. roots
2. stem
   1. plants may have two types of stems
      1. woody stem
      2. herbaceous stem
3. leaves
   1. cell layers of leaves
      1. epidermis
         1. stomata
      2. palisade cells
      3. spongy cells
4. vascular system
   1. contains three types of tissues
      1. xylem
      2. phloem
      3. cambium

1. Gymnosperms
   1. produce seeds that are not protected by a fruit
      1. Are divided into four divisions
         1. Conifers
         2. cycads
         3. ginkgos
         4. Gnetophytes
2. Angiosperm
   1. forming one or more seeds protected by a fruit
      1. Angiosperms are divided into two groups
         1. monocots
         2. dicotyledon

1. RHIZOIDS
2. STEM
3. LEAVES