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Worksheets12 QCAA Unit 3 Ecology
Total questions: 75
Worksheet time: 1hrs 11mins
lack of food
What type of growth model is shown in image A?
Exponential
Logistic
What type of factor has an increasing impact as the population size increases?
density-independent
density-dependent
cohort effect
survivorship factor
What point on the graph represents carrying capacity?
a
b
c
d
Which choice most closely approximates the deer population's carrying capacity based on the graph?
100
80
60
10
The Florida Panther is a large cat that is native to the southern parts of Florida. Recently, the panther's main food source, rabbits, have been infected with a deadly disease that only affects rabbits. How would this most likely affect the population of panthers in the coming years?
The panther population will decrease since they won't have access to as much food
The panther population will not be affected because they will adapt to eating other food
The panther population will increase because they will produce more offspring to make up the difference
The panther population will decrease because they will contract the disease.
The average number of individuals of the same species per unit of surface area at a given time is the ……………………
population density
population growth
population birth rate
population size
The highest rate of reproduction of a population under ideal conditions is called the:
biotic potential
environmental resistance
carrying capacity
birth rate
Population size for larger, mobile populations (eg: turtles) is calculated using the _________________
Species richness
Species diversity index
Lincoln index
Population growth rate
An organism is small in size and has a short life span. It is fast maturing and produces many offspring at a young age. The young stay with the mother for only a short period of time.
This demonstrates a
K-strategist
r-strategist
initially r-strategist and becomes a K-strategist
Sits between a K and r-strategist
Which of the figures shows a population which has reached carrying capacity?
A
B
C
D
Which of the figures shows a population experiencing exponential growth?
A
B
C
D
A parasite, infecting the organs of its host, spreads from host to host more rapidly when the host population, in a given area, is higher. This would be an example of control of the host population through
Density dependent factor
Density independent factor
All of the biotic and abiotic factors within a particular environment
Ecosystem
Community
Biome
Population
A frog eats a fly. The frog and fly are demonstrating ________.
Predation
Mutualism
Commensalism
Parasitism
All of the organisms of one species within a particular ecosystem
Population
Community
Ecosystem
Species
Why is "A" less biodiverse than "B"?
Image "A" is more biodiverse.
Image "A" has many corn plants and this makes it have high "rich" biodiversity.
Image "A" has a lot more plants than image "B"
Even though "A" has a lot of corn plants they are all the same species and makes this a low "poor" biodiverse area.
A community is
Several different populations scattered across several states.
Several different organisms in the same geographic area
One type of organism in the same geographic area
Several different populations in the same geographic area
What features does a Platyspiza have?
Two organisms that are so similar they can interbreed in nature and produce fertile offspring.
biotic factor
herbivore
ecosystem
species
A relationship that occurs when two or more organism of the same species need the same resource at the same time
Which of the following best describes primary succession?
Volcano wipes out ecosystem that gradually grows back from ash covered soil
Volcano creates a new island of rock that must break down to form an ecosystem
Forest fire burns down forest that must bounce back over time
Tornado destroys a crop that must slowly grow back over time.
___ are the first organisms to colonize an area and begin the process of ecological succession.
foundational organisms
introductory organisms
primary organisms
pioneer species
What is the main difference between primary and secondary ecological succession?
Primary begins WITHOUT soil; Secondary begins WITH soil
Primary is the first state and secondary is the second stage
Primary builds plant community; secondary builds animal community.
Primary begins WITH soil; Secondary begins WITHOUT soil
What is the term that describes a steady and stable community?
peak community
turf community
climax community
disturbed community
A species that plays a critical role in the health, maintenance, growth, or definition of an ecosystem.
keystone
invasive
engineer
predator
A species that does not belong in a balanced ecosystem, comes in, and changes it (usually for the worse).
flagnship
umbrella
invasive
predator
In the diagram, which of the processes labelled A to D transfers the largest mass of carbon pr year in a woodland ecosystem?
A
B
C
D
Which organism is best described as a saprotroph?
A fungus that digests its food externally and absorbs the products of digestion
A beetle that feeds by ingesting the dung of other animal species and digesting its food internally
A single-celled eukaryote that is able to photosynthesize and consumes smaller organisms by endocytosis
A giraffe that feeds by ingesting leaves from an acacia tree
The diagram shows the food web for an aquatic ecosystem in which letters R-Z represent individual species.
Which organism is a tertiary consumer?
T
U
W
Y
The diagram shows interactions between food chains in an ecosystem in the African savannah.
Which arrows indicate the flow of chemical energy?
I and II only
I and III only
II and III only
I, II and III
Animals in the highest trophic level of a food chain will often be the largest in body size but will be few in numbers. What accounts for the small numbers?
Food eaten by animals at the highest trophic level has a lower energy content per gram
Energy losses through the food chain
Conversion of heat energy into chemical energy
Biomass of producers is small
The Venus flytrap (Dionaea muscipula) is a photosynthetic plant. It obtains nitrogen but not energy by digesting captured insects. What is it's mode of nutrition?
Secondary consumer
Autotroph
Primary consumer
Saprotroph
Which category of organisms is correctly described by its method of nutrition and site of digestion?
A
B
C
D
The image shows a food web. Which organism is assigned to its method of nutrition?
A violet webcap fungus is both an autotroph and a heterotroph.
A pillbug is a secondary consumer.
Bacteria are saprotrophs.
A violet webcap fungus is a detritivore.
Which processes occur in an ecosystem?
I. Biomass increases in each successive trophic level.
II. Inorganic nutrients are recycled.
III. Chemical energy is stored in carbon compounds.
I and II only
I and III only
II and III only
I, II and III
By what process does Carbon dioxide move from the atmosphere into the oceans?
diffusion
photosynthesis
Active transport
differentiation
Which process is responsible for reducing atmospheric CO2?
Photosynthesis
Respiration
Combustion
Plants decaying
Which of the following is the least closely related organism:
Grey wolf - Canis lupis
Aardwolf - Poteles cristatus
Coyote -Canis latrans
Grey wolf
Aardwolf
Coyote
They are all related equally
What is the correct order of the classification levels
Kingdom Phylum Class Order Family Genus Species
Phylum Order Kingdom Family Genus Species Class
Phylum Kingdom Class Genus Order Family Species
Species Kingdom Class Order Phylum Family Genus
The ecological role an organism performs in their specific environment is considered the organism's...
Habitat
Population
Biome
Niche
The population is divided into groups or strata, based on some characteristic. Then, within each group, a sample is selected.
Simple Random Sampling.
Parameter
Statistic
Stratified Sampling
Which of these is responsible for flattening the logistic growth curve?
Numerical dominance
Carrying capacity
Lambda
Growth rate
A rhinoceros is ____.
K selected
r selected
What is the name of the survey used to assess changing biotic data across ecosystem profiles?
Line transect
Quadrat survey
Mark and recapture
Linear sampling
Lava from an erupting volcano flowed over a meadow. The lava cooled and hardened. Over time, the area underwent primary succession. Assuming that the ecosystem did not experience another major disturbance, which graph most likely shows how the populations of living things changed during the first few years after the volcanic eruption?
Which area has the highest biodiversity?
0.26
0.67
0.78
0.82
Calculate the Simpsons biodiversity index of the community below correct to one decimal place (use pen and paper to draw a table)
Sea holly: 2
Sand Couch: 8
Sea bindweed: 1
Sporobolus pungens: 1
Echinophora spinosa: 3
Total: 15
0.7
15
0.3
10
Identify which image below is showing a population:
What is the species richness for the following data collected?
A: 25
B: 16
C: 12
D: 1
0.07
4
54
cannot be determined
