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29 Cards in this Set
- Front
- Back
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Define algae |
Group of mostly photosynthetic organisms that are not necessarily related |
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Uses of algae in nature |
Habitats, shelter, food , symbiotic relationships |
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Rule of thumb for amount of plants and animals |
10g of plant for 1g of animal |
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What is an algae |
A polyphyletic assemblage of organisms that can grow up to 25m. Lack reproductive features of land plants. Mostly photosynthetic |
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Primary chloroplast |
Red algae, plants ect |
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Secondary chloroplast |
Original prokaryote (ate a chloroplast and was eaten itself |
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Algal habitats |
Pelagic, planktonic, nektonic, benthic, terrestrial,symbiotic |
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Pelagic |
Free water |
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Planktonic |
Floats in currents |
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Nektonic |
Swim (ie with flagellae) |
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Benthic |
Bottom dwelling |
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Can algae sink |
Yes. Dead cells sink faster. Sone form chains to slow sinking, ie diatoms |
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How do algae defend themselves |
Spines, armour, toxins, cyst formation, motility, transparency, luminescence |
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Motility of algae |
Being able to find up and down. Photo, geo and chemotactic responses. Can detect nutrients, prey, UV. |
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Can algae move |
Yes, wit cilia, flagella or pseudopodia, gliding, gas vesicles |
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Coenocytes |
Multinucleate tubes |
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3D structures |
Parenchyma |
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Chains of algae |
Filaments |
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Sheets of algae |
Membranes |
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Algal blooms |
Cause fish and invertebrate deaths- stick in gills, lack of O2 |
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Type of algae |
Averages, stramenophiles, brown, red, green algae |
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Alveolates- name, characteristics and dangers |
Dinoflagellates: unicellular, can be endosymbionts, chloroplasts. 2 flagellae, membrane sacs, cellulose plates Fish poisoning, turtle cancers, paralytic shellfish syndrome
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Stramenophiles- name, characteristics and dangers |
Diatoms. Bilateral symmetry, photosynthetic, act as C to sink to floors. Unicellular, no flagella, chlorophyll, fresh and salt water, sexual and asexual reproduction. Amnesic shellfish poisoning, kills seals |
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Brown Algae- name, characteristics and dangers |
Looks like seaweed, micro to macro, important habitats, rocky shores, temperate, most complex anatomy, 2 flagella (only in reproductive stages),asexual and sexual. |
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Parts of a brown algae |
Thallus, holdfast, blades, float, stipe, frond |
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What eats brown algae |
Echinoids |
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Uses of brown algae |
Fertilises, stock feed, human food |
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Red algae- name, characteristics and dangers |
At depth. Uni and multicellular, no flagella, asexual and sexual, calcareous thallus, edible. |
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Green algae- name, characteristics and dangers |
Closest to land plants, marine and freshwater, uni, multi, symbiotic, colonial |
