Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
BIOLOGY - algae
test tomorrow!
| Question | Answer |
|---|---|
| define algae. | autotrophic, contains chrlorophyll A and carry out photosynthesis |
| what kingdom do algae belong to? | protista |
| true or false: algae are autotrophic and are considered plant-like because they contain chlorophyll and carry out photosynthesis | true |
| what percentage of the world's atmospheric oxygen does algae produce? | 90% |
| why are most algae found floating near the surface of fresh and salt water? | because they require sunlight |
| true or false: there are algae that are multicellular and some that are unicellular. | true |
| how large can algae grow to be? | 70 meters/230 feet |
| define plankton. | the mass of mostly microscopic organisms that float freely in the waters of aquatic environments |
| true or false: algae make up the ocean's plankton. | true |
| what is the largest food source of water dwelling organisms? | plankton |
| how are algae classified? | according to the pigments they contain |
| CHRYSOPHYTA is? | golden algae, its unicellular. contains 12,000 species and shelled organisms, have a cell wall of silica; example: diatoms, which have 2 identical halves |
| PYRROPHYTA is? | fire algae, its unicellular. 1,100 species, red colored; make up the ocean's phytoplankton. |
| what is the largest group of fire algae? | dinoflagellates; these are the algae responsible for red tide, caused when algae blooms |
| CHLOROPHYTA is? | green algae, its multicellular. 7,000 species exist in this phyla. only a few species are marine, most are freshwater and they range from microscopic up to 8m long, they are similar to greem plants on land. examples: volvox and spirogyra |
| PHAEOPHYTA is? | brown algae, its multicellular. 1,500 species; nearly all species are marine, are found on rocky coasts and in cooler waters |
| what does an air bladder do? | it helps keep large seaweed and kelp stay afloat |
| what is the largest of the algae? | brown algae (phaeophyta) |
| true or false: brown algae is important economically? | true |
| RHODOPHYTA is? | red algae, its multicellular. 4,000 species. found in many places, but common in tropical oceans and are almost entirely marine. the colors can range from yellow, reddish-purple, and red. they grow in deeper waters than other algaes. |
| what allows the aborption of blue light? | phycobillins. |
| diatoms are in what classification? | golden algae (chrysophyta) |
| most species are freshwater and similar to plants. | green algae (chlorophyta) |
| makes up the ocean's phytoplankton. | fire algae (pyrrophyta) |
| what is responsible for red tide? | dinoflagellates |
| the largest of the algae. | brown algae (phaeophyta) |
| almost all entirely marine, they grow in deeper water than other algae. | red algae (rhodophyta) |
| true or false: multicellular algae lack true roots, stems, leaves, flowers, fruits, and seeds. | true |
| define thallus. | the simple body of a multicellular algae |
| what 3 things are a thallus composed of? | 1) hold fast 2) stipe 3) blade |
| what is a hold fast? | root-like extension, doesn't nourish a true root |
| what is a stipe? | stem-like area, flexible; functions to allow blades to be close to the surface for light absorption |
| what is a blade? | leaf-like area, site of sexual reproduction |
| what of 2 ways do algae reproduce? | sexual & asexual |
| what 3 groups of algae contain seaweed? | green, red, and brown |
| what variety of products is seaweed a source of? | food (primarily in Asian nations), potash (important fertilizer), & iodine (primarily in Russia) |
| true or false: algin has the ability to absorb great quantities of water, used in foods, medicines, etc. | true |
| what do microbes grow on, also found in canned foods and cereals? | agar |
| what product is used in foods as a thickening agent? | carrageenan |
| define diatom. | a unicellular alga that has a double shell that contains silica |
Created by:
Lauren_Chambless