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L3 Seedless Vascular Plants

L3 Seedless Vascular Plants - ReviewofLecture2 1 2 3 4 5...

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Review of Lecture 2 1. Classification and Systematics 2. The Challenges: getting out of the water 3. Environmental constraints 4. The Innovations: drought tolerance 5. The Nonvascular Plants:  The Bryophytes a) Similarities to green algae and to vascular plants b) Alternation of generations
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Scientific Classification Making sense of what might otherwise  appear to be unrelated and/or  random. How many things are in common and  how many things differ? ( reiterative patterns and modules )  
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Organisms are classified  into a hierarchy of  categories or levels Tree of life (hypothesis): Chap. 16, pg. 362
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Scientific Classification What are the trends? Simple Simple     Complex Complex
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Scientific Classification Simple Simple     Complex Complex Volvox Chara Chlamydomonas Algae Bryophytes
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Algae: Phylum Chlorophyta Volvox Chara 1. Most live in fresh water 2. Some are terrestrial 3. Have chlorophylls a and b 4. Store starch inside plastids Chlamydomonas
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The challenges 1. Harvesting light energy 2. Staying wet when things get dry 3. Dealing with gravity 4. Divide or be conquered  5. Leveraging resources
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Bryo phyte s EARTH No nvas c ular Plants
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Similarities to Green Algae 1. Shares cellulosic wall composition 2. Shares features of cell division 3. Phytochrome pigment is present 4. Chloroplasts contain chlorophyll a and b  and carotenoids 5. Chloroplast anatomy is similar Chara
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Similarities to Vascular Plants 1. Male and female reproductive structures are  protected 2. Multicellular embryo is protected within the  female parent 3. Sporophyte produces spores by meiosis 4. Sterile cell layer protects multicellular  sporangia  (hollow structures that contain  spores) © R.T. Webb 2007
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Distinct from Vascular Plants 1. Have body structures anatomically similar to leaves  and stems called  thalli  ( thallus , singular) 2. Have anchoring structures called  rhizoids  (like roots  but do not serve in absorption) 3. Have water-conducting cells called  hydroids 4. Have food-conducting cells called  leptoids 5. Some bryophytes have stomata for transpiration © RTW 2007
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Bryophytes: The innovations Just add water!
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