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WorksheetsExam Review: Ecology & Life Functions
Total questions: 21
Worksheet time: 11mins
Which statement about the carbon cycle is true?
Carbon dioxide is released to the atmosphere by animal & plant cellular respiration.
The carbon cycle ends when an organism dies.
Only animals are involved in the carbon cycle.
Carbon exists only as carbon dioxide in the cycle.
Deforestation removes trees; why would atmospheric carbon dioxide increase as a result of this?
Grass often replaces forests.
The trees shade the soil from the sun.
Farmers plant corn and soybeans.
There are fewer trees to take in carbon dioxide.
What would cause population growth to level out rather than increase exponentially?
limitations on resources
having infinite resources
low availability of sunlight
limited genetic diversity
Which process recycles and returns organic materials back into the environment after an organism dies?
decomposition
deposition
mutualism
photosynthesis
Which process provides most of the oxygen found in Earth’s atmosphere?
cellular respiration
photosynthesis
the nitrogen cycle
decomposition
We've noticed that in nature, small populations more easily become endangered or extinct. Given that this is true, which do you think will most directly determine the impact of an infectious disease on survival of a population?
climate
number of population members
food availability
habitat location
Lynx eat rabbits; which factor best explains why the lynx population remains relatively stable in number?
a limited amount of food
competition with other producers
commensalism with aphids
eating a variety of foods
Which organisms change nitrogen from an atmospheric gas into a useful form through nitrogen fixation?
fungi
plants
animals
bacteria
Large aphids defend feeding sites on a tree by kicking smaller aphids off of the best leaves. Which of the following terms best describes the interaction between the large aphids and the small aphids?
competition
mutualism
commensalism
parasitism
Which cycle theoretically has the greatest impact on climate change on Earth?
nitrogen cycle
carbon cycle
phosphorous cycle
water cycle
A scientist studying dolphin populations has noticed an increase in infant death. High levels of a toxin have been found in mothers’ fat. This toxin is passed to her infant in her milk. Which environmental problem does this best demonstrate?
bioaccumulation
biomagnification
energy loss
habitat destruction
Which best indicates that the carrying capacity of an area has been exceeded?
a steady increase in all species in an area
a constant number of various species over time
a sudden, rapid decline in many species in an area
a sharp increase in the population of one species
Which population is most likely to be affected by the biomagnification of toxins found in pesticides?
producers
primary consumers
secondary consumers
top level predators
Which is the correct representation of energy flow through an ecosystem?
water → squirrels → nuts
producers → consumers → sun
sun → producers → consumers
sun → consumers → producers
Which human activity causes an immediate increase in the amount of greenhouse gases in the atmosphere?
burning fossil fuels
deforestation
reforestation
recycling
Mosquitoes breed in water and are responsible for the transmission of malaria to humans. Which control method would be least likely to negatively impact the natural environment?
Put pesticides into ponds to kill mosquito larvae.
Stock ponds with fish species and other wildlife that feed on mosquito larvae.
Drain ponds so that mosquito eggs have nowhere to hatch.
Spray a light coat of oil over ponds to prevent respiration in mosquitoes.
Ants and Acacia trees have a symbiotic relationship. The tree provides the ants with nest sites and food while in return the ants defend the tree against consumers. Based on the information, how can the symbiosis best be classified?
mutualism
commensalism
parasitism
predation
What is one way animals can directly obtain nitrogen from their environment?
eating plants
through nitrogen fixation
absorption through drinking water
inhaling it from the air
Name the structure in euglena that allows it to find light for photosynthesis
eyespot
flagellum
contractile vacuole
nucleus
The stomach and intestines in humans aids in which life function?
nutrition/digestion
gas exchange
response to stimuli
reproduction
Which is not a life function/process?
reproduction
growth and development
response to stimuli
gas exchange
all of these are life functions/processes
