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WorksheetsPrimary Consumers 2
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
Why do soil microbes have to excrete their digestive enzymes to the outside of their cells?
a)
dead organic matter polymers are too large to pass through microbial membranes otherwise
b)
dead organic matter polymers contain a high proportion of low energy compounds that may be removed prior to microbial uptake
c)
dead organic matter polymers contain a high proportion of low nutrient compounds that may be removed prior to microbial uptake
d)
dead organic matter polymers often must be de-toxified prior to microbial uptake
2.
Most soil bacteria near the soil surface are ______
a)
heterotrophs
b)
autotrophs
c)
chemotrophs
d)
chemoautotrophs
3.
What do rhizosphere bacteria gain from plants?
a)
carbohydrates
b)
nutrients
c)
extracellular enzymes
d)
carbon dioxide
4.
The high biodiversity of soil organisms is made possible by high _____, allowing for strong trophic niche differentiation.
a)
competition
b)
thermal stability
c)
heterogeneity
d)
resource availability
5.
At which trophic level can you find a primary consumer?
a)
1st Level
b)
2nd Level
c)
3rd Level
d)
4th Level
6.
Soil bacteria can fill which of these roles in soil?
a)
plant pathogen
b)
food source
c)
soil aggregation
d)
all of these are correct
7.
A bacteria is an organism whose cells
a)
lack cell walls
b)
may have an open, tube-like structure
c)
can never produce chlorophyll
d)
all of these are correct
e)
none of these are correct
8.
The bulk of organic matter entering the soil ultimately gets converted to
a)
carbon dioxide
b)
glucose
c)
plant-available nutrients
d)
stabilized soil carbon
9.
The highest soil organic matter content would be expected
a)
In cold environments, due to low decomposition
b)
In hot environments, due to high plant productivity
c)
Soil organic matter content is ultimately not a function of climate
d)
In temperate environments, due to the balance of intermediate decomposition and plant productivity
10.
The high biodiversity of soil organisms is made possible by high _____, allowing for strong trophic niche differentiation.
a)
competition
b)
thermal stability
c)
heterogeneity
d)
resource availability
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