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BIOB 170 Week 8 Notes

by: Isabella Sturgeon

BIOB 170 Week 8 Notes BIOB 170

Marketplace > University of Montana > Biology > BIOB 170 > BIOB 170 Week 8 Notes
Isabella Sturgeon
GPA 3.67

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About this Document

Here are my notes from week 8 of the BIOB 170 lecture. We continue to focus on plants.
Principles Biological Diversity
Dr. Kevin Murray
Class Notes
BIOB 170, Biology
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This 2 page Class Notes was uploaded by Isabella Sturgeon on Sunday March 20, 2016. The Class Notes belongs to BIOB 170 at University of Montana taught by Dr. Kevin Murray in Spring 2016. Since its upload, it has received 9 views. For similar materials see Principles Biological Diversity in Biology at University of Montana.


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Date Created: 03/20/16
Week 8 BIOB 170 Notes Bryophytes Contd. Liverworts (Hepatophyta) • Gametophytes are dominant- leafy or thalloid • Leafy: look like moss with lateral insertion of leaves • Thalloid o Marchantia- most commonly heard species o Doral and ventral are distinctive o Rhizoid on underside: analogous to o Sexual reproduction § Gametophyte produces either antheridia or archegonia § Antheridiophores are upright stalks with disks that hold antheridia § Archegoniophores are upright palm tree shaped that hold archegonia on underside § Water splashes and releases antheridia which bounce to archegoniophores o Asexual reproduction § Gemma cup • Contains gemmae which are splashed out and can grow into gametophytes Vascular plants • 420 million years ago xylem cells • 400 million years ago the first full fossil o Cooksonia § Upright growth § Dicotum branching § Sporophyte is dominant • 345 million years ago Carboniferous period o Seedless vascular plants everywhere • Distinguishing o 1. Vascular tissue § Xylem: transports water • Dead at maturity, form hollow tubes • H20 relies on water evaporation and hydrogen bonds pulling water up through xylem § Phloem: transports water, nutrients from photosynthesis o 2. Below ground roots § Differ anatomically than the cells in the stem o 3. Water proof cuticle § Can only obtain water through roots o 4. Stomata § Used for gas exchange o 5. Sporophyte dominant


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