BIOLOGY - algae Word Scramble

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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