5 Written questions
5 Matching questions
- Which of the following has the greatest effect on the rate of chemical cycling in an ecosystem?
the production efficiency of the ecosystem's consumers
the trophic efficiency of the ecosystem
the location of the nutrient reservoirs in the ecosystem
the rate of decomposition in the ecosystem
the ecosystem's rate of primary production
- Which of the following is not required for a behavioral trait to evolve by natural selection?
An individual's reproductive success depends in part on how the behavior is performed.
In each individual, the form of the behavior is determined entirely by genes.
An individual's genotype influences its behavioral phenotype.
The behavior varies among individuals.
Some component of the behavior is genetically inherited.
- Select the correct statement(s) about a terrestrial food chain.
Select all that apply.
The total biomass of the top trophic level is greatest because the top consumers are large.
About 1% of the energy stored in producers is converted to organic matter at the secondary consumer level.
Energy is transferred from decomposers to plants to herbivores to carnivores.
- Why is it that nitrogen is often a limiting plant nutrient, despite the fact that the atmosphere is 80% nitrogen gas (N2)?
Because plants cannot assimilate nitrogen-containing compounds
Because N2 easily leaches away from soil
Because plants cannot fix N2
- How do pyramids of net production and pyramids of biomass differ?
Pyramids of net production include fewer trophic levels than pyramids of biomass.
Unlike pyramids of biomass, pyramids of net production are based on measurements per unit time.
Unlike pyramids of net production, the shape of a pyramid of biomass varies with the size of the organisms in the ecosystem.
- a About 1% of the energy stored in producers is converted to organic matter at the secondary consumer level.
- b Because plants cannot fix N2
- c the rate of decomposition in the ecosystem
- d Unlike pyramids of biomass, pyramids of net production are based on measurements per unit time.
- e In each individual, the form of the behavior is determined entirely by genes.
5 Multiple choice questions
- Decomposition rate would decrease and NEP would increase.
- bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed.
- A pyramid of biomass may be inverted because it is based on biomass at one point in time. Pyramids of net production are based on productivity per unit time.
- two species that have exactly the same niche cannot coexist in a community.
- Patches of different habitats within the landscape
5 True/False questions
Which lake zone would be absent in a very shallow lake?
benthic zone → aphotic zone
Which of the following is characteristic of most terrestrial biomes?
clear boundaries between adjacent biomes
a distribution predicted almost entirely by rock and soil patterns
annual average rainfall in excess of 250 cm
vegetation demonstrating vertical layering
cold winter months → vegetation demonstrating vertical layering
This graph shows the effect of removal of urchins and limpets (alone and together) on seaweed cover. Select the statement that accurately describes the results shown in this graph.
Sea urchins have a much greater effect than limpets in limiting seaweed cover.
Removing only limpets increased seaweed cover dramatically.
The lack of change over time in the control plots (with urchins and limpets present) shows that limpets and urchins have no effect on seaweed cover. → large and close to a mainland.
Examine the climograph for some major North American biomes. Which two factors influence the distribution of organisms, as shown in this climograph?
The presence of tundra and presence of forested land
Annual mean temperature and annual mean precipitation
The presence of broadleaf and presence of coniferous forest → Annual mean temperature and annual mean precipitation
The most plausible hypothesis to explain why species richness is higher in tropical than in temperate regions is that
tropical communities are younger.
tropical regions have very high rates of immigration and very low rates of extinction.
diversity increases as evapotranspiration decreases.
higher temperatures cause more rapid speciation.
tropical regions generally have more available water and higher levels of solar radiation. → tropical regions generally have more available water and higher levels of solar radiation.