Chapter 29: Plant Diversity How plants colonized land Chapter 29.1 Admit Slip 3. List 3 words you think of when you look at the picture/diagram 2. Write 2 ideas you have based on the picture and your words. If possible, use your words as you write your ideas. 1. Write 1 question you have.
Admit Slip 3. List 3 words you think of when you look at the picture/diagram 2. Write 2 ideas you have based on the picture and your words. If possible, use your words as you write your ideas. 1. Write 1 question you have. Chapter 29: Plant Diversity. How plants colonized land Chapter 29.1. - PowerPoint PPT Presentation
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Chapter 29: Plant Diversity
How plants colonized landChapter 29.1
Admit Slip3. List 3 words you think of when you look at the picture/diagram
2. Write 2 ideas you have based on the picture and your words. If possible, use your words as you write your ideas.
1. Write 1 question you have.
Plants supply oxygen and are the ultimate provider of most of the food eaten or absorbed
by other organisms.
Terminology
• -phyte=Plant• Bryo=moss• Ptero=fern• Gymno=naked• Mitosis: division of cells-forms identical copy with full set of
chromosomes (2n), body cells• Meiosis: division of cells-forms a cell with a half set of
chromosomes (n), sex cells• Haploid: half the total chromosomes for an organism
(egg/sperm)• Diploid: full number of chromosomes for an organims (somatic)
What problems do terrestrial habitats offer for plants????
Land plants evolved from green algae
• Evolved from Charophytes (green algae) more than 500 million years ago.
• Evidence for evolution from Charophytes1. Both produce cellulose for cell walls the same way2. Their peroxisomes have enzymes that reduce effects of
photorespiration (unique to both)3. Both produce cell plates the same way during cell division4. Structure of sperm is closely related5. Nuclear and chloroplast genetic evidence suggests close
relation
2007-2008
Charophytes
Spirogyra
Coleochaete
Chara
Problems of life on land
Problems of life on land
Movement of plants from sea to land
• Advantages:– Increased sunlight (unfiltered by water)– More carbon dioxide in atmosphere than
water– Soils rich in nutrients– Fewer predators
• Challenges– Lack of water– Desiccation– Lack of structural support against gravity
Adaptations of Land Plants1. Adaptations in growth– apical meristem: localized region of cell
division at tips of roots and shoots2. Adaptations in reproduction– alternation of generations– walled spores: protect spores in harsh
environments– multicellular gametangia: structures for