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