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BIOLOGY - algae Test

Enter the letter for the matching Answer
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1.
what 3 things are a thallus composed of?
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2.
true or false: brown algae is important economically?
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3.
define algae.
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4.
what does an air bladder do?
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5.
what is the largest food source of water dwelling organisms?
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6.
define diatom.
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7.
the largest of the algae.
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8.
what do microbes grow on, also found in canned foods and cereals?
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9.
how large can algae grow to be?
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10.
what is a stipe?
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11.
define thallus.
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12.
define plankton.
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13.
what kingdom do algae belong to?
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14.
what variety of products is seaweed a source of?
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15.
what 3 groups of algae contain seaweed?
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16.
what percentage of the world's atmospheric oxygen does algae produce?
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17.
CHLOROPHYTA is?
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18.
why are most algae found floating near the surface of fresh and salt water?
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19.
what allows the aborption of blue light?
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20.
PYRROPHYTA is?
A.
green, red, and brown
B.
the simple body of a multicellular algae
C.
brown algae (phaeophyta)
D.
1) hold fast 2) stipe 3) blade
E.
protista
F.
agar
G.
90%
H.
stem-like area, flexible; functions to allow blades to be close to the surface for light absorption
I.
a unicellular alga that has a double shell that contains silica
J.
food (primarily in Asian nations), potash (important fertilizer), & iodine (primarily in Russia)
K.
phycobillins.
L.
it helps keep large seaweed and kelp stay afloat
M.
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
N.
70 meters/230 feet
O.
autotrophic, contains chrlorophyll A and carry out photosynthesis
P.
the mass of mostly microscopic organisms that float freely in the waters of aquatic environments
Q.
true
R.
fire algae, its unicellular. 1,100 species, red colored; make up the ocean's phytoplankton.
S.
because they require sunlight
T.
plankton
Type the Answer that corresponds to the displayed Question.
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21.
what product is used in foods as a thickening agent?
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22.
most species are freshwater and similar to plants.
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23.
what is the largest of the algae?
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24.
almost all entirely marine, they grow in deeper water than other algae.
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25.
makes up the ocean's phytoplankton.
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26.
what of 2 ways do algae reproduce?
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27.
what is responsible for red tide?
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28.
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.
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29.
brown algae, its multicellular. 1,500 species; nearly all species are marine, are found on rocky coasts and in cooler waters
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30.
golden algae, its unicellular. contains 12,000 species and shelled organisms, have a cell wall of silica; example: diatoms, which have 2 identical halves

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