11 October 2011
S.I. Session 18 Quiz
This quiz covers material from the lecture on Monday, October 10th.
Part a) Match the term to its definition:
TERMS:
a)Biosphere b)Ecosystems c)Hallucigenia
d)Extremophiles e)Photosynthesis f)Stromatolites
g)Cyanobacteria h)Trilobites i)Banded Iron Formations
DEFINITIONS:
1)__Microbial mats, evidence for early microbial activity.
2)__The part of the earth’s system that contains all living organisms.
3)__A metabolic process in which sunlight, water, and carbon-dioxide from the environment are converted into carbohydrates.
4)__Flux of energy and matter between organisms and the environment.
5) __The rise of Oxygen in the earth’s atmosphere eventually led to the formation of these, which are red and present in some parts of the geologic record.
6)__These organisms thrive in very salty or very hot environments or environments high in methane or lacking oxygen.
7)__These organisms are among the first to perform photosynthesis and are responsible for oxidizing the abundant iron dissolved in the oceans.
8)__&__These are fossils associated with the abrupt Cambrian radiation of species.
Part b) Explain how stromatolites are formed:
Part c) True or False:
Mark T (true) or F (false) in the blank provided:
1)__Plants appear before animals in the geologic record.
2)__Single celled microorganisms are relatively homogeneous in terms of genetic diversity.
3)__Ecosystems are insensitive to meteorite impacts, large volcanic eruptions, and rapid global warming.
4)__Carbon Dioxide is a by-product of photosynthesis.
5)__An example of direct biomineralization is the formation of tiny particles of magnetite inside some bacteria.
6)__ An example of direct biomineralization is calcium carbonate precipitating on the surface of microorganisms.
7)__A biogeochemical cycle involves an element moving between the biosphere and the geosphere.
8)__The hemisphere is the part of the earth system that contains all living organisms.
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