ECOLOGY TEST REVIEW ANSWERS
Name:
1. ecology trophic
level biotic
niche
ecosystem
biomass abiotic
biotic habitat
producer
omnivore
consumer decomposer herbivore
a) an organism that breaks down waste and other dead organisms.
- decomposer
b) An organism that survives by feeding on other organisms
- consumer
c) The interrelationships between organisms and their environment - ecology
d) An adjective that means “living”
- biotic
e) Mass of biological material
-biomass
f) An organism that manufactures its own food through the process of
photosynthesis.
- producer
g) The area where an organism lives with conditions to support it
- habitat
h) The “level” at which an organism feeds
- trophic
i) An adjective that means “non-living”
- abiotic
2. Construct an energy/biomass pyramid with the following food chain:
grass
mouse
snake
hawk
a) Assign 10,000 kg of biomass to the producer level and indicate the total biomass at all
other levels of the pyramid.
b) Beside each level, indicate the producer, primary consumer, secondary consumer and
tertiary consumer.
c) How much energy is lost at each level? – 90% How much is passed on? -10%
3. Write the chemical and word equation for photosynthesis:
- C02 +
H20 + light energy = C6H1206 + 02
-carbon dioxide + water + light energy = sugar + oxygen
4. Why are photosynthesis and cellular respiration considered complementary processes.
- because the carbon they use is repeatedly cycled through both processes (opposite)
5. Explain the difference between organic and inorganic matter.
- Organic contains carbon and hydrogen atoms; often oxygen and nitrogen
atoms,whereas inorganic substances do not contain a combination of carbon and
hydrogen atoms.
6. What 4 factors regulate biotic potential?
- birth potential – procreation – capacity for survival – length of reproductive life
7. What are 2 abiotic factors and 2 communities that live in the grassland biome?
- longer growing season – moderate temperature – grasshoppers, voles, field mice
8. Why can organic carbon be trapped in the Earth’s crust (in bogs) in the form of fossil
fuels for millions of years?
-because they have a small amount of oxygen, so decomposition is very slow and
carbon atoms are locked away; forming fossil fuels
9. Determine the population of flowers in a field: 150m by 200 m. A sample size of 6m2
is chosen. The trials are as follows: 8, 5, 7, 3, 11.
8 + 5+7+3+11 = 34 divided by 5 = 6.8
150m X 200m = 30,000m 2
30,000 m2 divided by 6m2 = 5,000
5,000 X 6.8 = 73.5
Therefore, there are approximately 73.5 flowers.
10. One day, 13 grasshoppers were caught, tagged, and then released. On day two, 10
were caught, of which 7 were found to already have tags. Determine the population of
grasshoppers.
13 = 7
7X = 10 X 13
X
10
7X= 130
Therefore, there are approximately 18.6
X= 130
grasshoppers.
7
X= 18.6