1 Kingdom Plantae The Plants- Kingdom Plantae • Multicellular, eukaryotic, photosynthetic, autotrophic • All have: – Chloroplasts, evolved from single-celled green algae – Non-motile, rigid cell wall, sexual reproduction – Require light, water, minerals, CO 2 , other stuff which they must get from their environment The First Plants- The Algae • Plant evolution begins in the sea • Single celled Multicelled colonies – But still have very little specialization between cells • Three divisions of algae- all can be seen in tide pools – Rhodophyta- Red Algae – Phaeophyta- Brown Algae – Chlorophyta- Green Algae Life cycles of most algae • 2 multicellular phases- Alternation of Generation • 2n n 2n n….etc. • Sporophyte and Gametophyte • One phase may be dominant in structure • Example on board and overhead General Algal /Plant lifecycle Plants move onto Land Advantages • Low competition • Low predation • Ample sunlight • Ample landscape • Higher CO 2 Challenges • Motile sperm need water • No water to hold up body • H 2 O, minerals- absorb and transport issues • Desiccation • Dispersal problems • Temperature changes • Need to protect embryos
12
Embed
Kingdom Plantae The Plants- Kingdom Plantae · Kingdom Plantae The Plants- Kingdom Plantae ... Pollen Pine pollen Winged seed of a White Pine ... Pollen grains Fig. 15.5
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.