Bio 106 Exam 2
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What are Charophyceans?
- Green Algea
- Closest relatives of land plants
What are the 5 Key traits Charophyceans share with Land Plants?
- 1. Similarities in Cell Wall Synthesis
- 2. Peroxisome Enzymes - Minimize loss of organic products
- 3. Structure of Sperm4. Similarities During Cell Division
- 5.Homologous Chloroplast
What is Sporopollenin?
Sporopollenin is a layer of durable polymer in Charophyceans that prevents exposed zygotes from drying out
5 Key Traits in Nearly All Land Plants
- 1. Apical Meristems - Regions of cell division at tips of roots and shoots that let plant extend to get water and nutrients.
- 2. Alternation of Generations - (gametophytes and Sporophytes)3. Walled Spores Produced in Sporangia4. Multicellular gametangia5. Multicellular dependent dependent embryos
Cells joined in tubes to transport water and nutrients
Byrophytes and examples
- Non-vascular Plants
- - Liverworts phylum Hepatophyta
- - Hornworts phylum Anthocerophyta
- - Mosses phylum Byrophyta
Ecological and Economic Importance of Mosses
- "Peat Moss"
- Forms ectensive deposits known as Peat
- Earth's carbon Cycle
What plants formed the First Forests?
- Ferns and other seedless vascular plants
- Sporophyte Dominant
Two Types of Vascular Tissue
Xylem - Conducts mostly water and minerals consists of dead cells
Phloem - Distributes sugars, amino acids, and other organic products consists of living cells
Organs that anchor vascular plants and absorbs water and nutrients from the soil
Leaves ans the two types
- Increase the surface area to capture solar energy
- 1. Microphylls - Leaves with single vein
- 2. Megaphylls - leaves with a highly branched vascular system
Sporophylls and spore variations
- Modified leaves with sporangia
- * Sporangia produces spores
- Variations: Homosporous - one type of sporangium that produces one type of spore.Heterosporous - 2 sporangia and produces 2 kinds of spores.
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