QUESTION 5 Dinoflagellates are often regarded negatively because of fish kills a
ID: 50706 • Letter: Q
Question
QUESTION 5
Dinoflagellates are often regarded negatively because of fish kills associated with red tides, but they are beneficial to some marine ecosystems because
red tides only kill undesirable fish
their shells form limestone deposits when they die
they form zooxanthelae that have a mutualistic relationship with coral polyps
they make nutrients available o other planktonic species by converting ammonia into nitrate
10 points
QUESTION 6
You are working on a team to characterize a local lake's plankton community. Using a compound microscope, you isolate one specimen from a water sample. It is unicellular and has a specialized feeding groove cut into the cell surface. To what supergroup does this organism belong?
Excavata
Alveolata
Amebozoa
Opisthokonta
10 points
QUESTION 7
The group of protists to which you are most closely related is
slime molds
excavata
choanoflagellates
amoebas
10 points
QUESTION 8
Why are photosynthetic marine algae often not green colored like photosynthetic terrestrial plants?
they do not perform oxidative photosynthesis
the different colored pigments absort the different wavelengths of light in the water
the algae are actually green when taken out of the water
the algae are parasitized by other protists that have different pigments
red tides only kill undesirable fish
their shells form limestone deposits when they die
they form zooxanthelae that have a mutualistic relationship with coral polyps
they make nutrients available o other planktonic species by converting ammonia into nitrate
Explanation / Answer
5. they form zooxanthelae that have a mutualistic relationship with coral polyps
Due to their symbiotic relationship with coral polyps dinoflagellates are vital in coral reef formation.
6. Excavata
Excavata is the supergroup characterized by feeding groove and is unicellular
7. choanoflagellates
Scientists have often referred to choanoflagellates to be most closely related with animals.
8. the different colored pigments absorb the different wavelengths of light in the water
Plants absorb energy from the light which reaches them. Therefore, in order to harvest more energy different colored pigments absorb different light and hence, the color of the plant develops accordingly.
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