25.2 Green algae: precursors of land plants

Question 1

Streprophyta

Answer 1

all land animals and green algea together. is a monophyletic group
- brown, red and gold algea are not part of this because they are actually protista.

Question 2

Green algae

Answer 2

• alpha and beta carotenoids and chlorophyll
• carbs stored as starch
• divide among phragmoplasts (cell plates) layered in the same manner as embryophyes

Question 3

Chlorophyta

Answer 3

green algae that are not charophytes
- can live almost anywhere
- some are single celled
- some form colonies

Question 4

Chlorophta (reproduction)

Answer 4

• asexually through fragmentation or spore production
• sexually through fusion of gametes in fertilization
  - single-celled so don’t undergo mitosis
  - multicellular so there is a sporophyte from mitosis

Question 5

Charophytes

Answer 5

Have orders: Charales & Coleochaetes
- are the closest living thing to embryophytes
- large cells form their thallus
- do not have alternation of generations unlike land plants
- have lignin and sporopollenin like land plants

Recently order: Zygnematales
- discovered to portentially be closer to embryophytes than the other two.