Bio 106 Exam 2
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Bio 106 Exam 2
Biology 106 Plant Bio Exam 2
What are Charophyceans?
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 Sperm
4. Similarities During Cell Division
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 Sporangia
4. Multicellular gametangia
5. Multicellular dependent dependent embryos
Cells joined in tubes to transport water and nutrients
Byrophytes and examples
- Liverworts phylum Hepatophyta
- Hornworts phylum Anthocerophyta
- Mosses phylum Byrophyta
Ecological and Economic Importance of Mosses
Forms ectensive deposits known as Peat
Earth's carbon Cycle
What plants formed the First Forests?
Ferns and other seedless vascular plants
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
Homosporous - one type of sporangium that produces one type of spore.
Heterosporous - 2 sporangia and produces 2 kinds of spores.