CSIR UGC NET JRF Ecology Model Test

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1. The two fundamental processes that govern the dynamics of an ecosystem are
solar radiation and the carbon cycle
photosynthesis and respiration
the carbon cycle and photosynthesis
energy flow and chemical/nutrient cycling
2. A host plant produces a toxin that is lethal to aphids feeding on its leaves. Over time, some of the aphids become immune to the toxin. In response, the host plant begins to produce a different toxin that is lethal to aphids. This is an example of
parasitism
coevolution
mutualism
commensalism
3. The use of specially bred strains of bacteria to clean up oil spills along beaches is an example of
primary succession
decomposition
eutrophication
bioremediation
4. Which of the following best describes a pattern of idealized population growth that is restricted by limiting factors?
logistic growth model
carrying capacity model
exponential growth model
habitat cap model
5. Which of the following terms best encompasses all of the populations of organisms living together and potentially interacting in an area?
carrying capacity
biome
biological community
geographical community
6. The human population, from Stone Age times to the present, is best represented by
an exponential growth curve
a logistic growth curve
a normal distribution curve
a random growth curve
7. Which of the following would NOT be considered a density-dependent factor affecting population size?
competition
parasitism
disease epidemic
tornado
8. The role of a particular species within an ecosystem, including all of its interactions with both biotic and abiotic factors, is known as the species’
ecological niche
habitat
carrying capacity
dispersion pattern
9. Mutualistic interactions among species in an ecosystem would be characterized as
−/−
−/0
+/0
+/+
10. Approximately 4% of the turtle population in the local pond shows the recessive phenotype— long nose (nn).What is the frequency of the dominant allele (N) in the population? What is the frequency of heterozygotes in the population?
0.16, 0.08
0.20, 0.24
0.80, 0.32
0.32, 0.64
Score =
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