Worksheets7th Grade Science Review Evolution and Ecology
Total questions: 33
Worksheet time: 17mins
A _____________ shows how food chains in a community are interconnected and models energy transfer
food chain
food web
energy pyramid
How much available energy is passed onto the next trophic level?
1%
10%
100%
Which organism is a producer?
cow
dog
grass
human
Which trophic level has the most energy available to living things?
Trophic level 1
Trophic level 2
Trophic level 3
In which process do producers use chemical energy and make food?
chemosynthesis
fermentation
glycolysis
photosynthesis
What organisms help break down dead leaves in an ecosystem?
carnivores
detritivores
herbivores
omnivores
Which step of the water cycle occurs in plants?
condensation
evaporation
precipitation
transpiration
Which is an example of a food chain shown above?
diatoms>krill>leopard seal
fish>krill>squid
diatoms>krill>fish
squid>fish>leopard seal
During which process is oxygen gas released into the atmosphere?
chemosynthesis
decomposition
photosynthesis
transpiration
Which is true of the amount of matter in ecosystems?
It decreases over time
It increases over time
It remains constant
Scientists cannot determine how it changes.
Which includes both an abiotic and a biotic factor?
a chicken laying an egg
a deer drinking from a stream
a rock rolling down a hill
a squirrel eating an acorn
Why do scientists think the fossil record is incomplete?
Fossils decompose over time
The formation of fossils is rare
Only organisms with hard parts become fossils
There are no fossils before the Phanerozoic eon.
What can scientists learn about fossils using techniques of absolute-age dating?
estimated ages of fossils in rock layers
precise ages of fossils in rock layers
causes of fossil disappearances in rock layers
structural similarities to other fossils in rock
Which is the sequence by which natural selection works?
selection>adaptation>variation
selection>variation>adaptation
variation>adaptation>selection
variation>selection>adaptation
Which may form over time from the impression a bird feather makes in mud?
cast
mold
fossil film
trace fossil
Which is the source of variations in a population of organisms?
changes in environment
changes in genes
the interaction of genes with an environment
the interaction of individuals with an environment
Which is NOT an example of a vestigial structure?
eyes of a blind salamander
pelvic bones in a whale
thorns on a rose bush
wings on a flightless bird
Which do the images above represent?
analogous structures
embryological structures
homologous structures
vestigial structures
Which is an example of a sudden change that could lead to the extinction of species?
a mountain range isolates a species
Earth's tectonic plates move
a volcano erupts
sea level changes
Which term describes the method Darwin used that resulted in cows with desired traits?
evolution
mimicry
natural selection
selective breeding
What is an adaptation?
a body part that has lost its original function through evolution
a characteristic that better equips an organism to survive in its environment
a feature that appears briefly during early development
a slight difference among the individuals in a species
The observation that the Galapagos tortoises did not all live in the same environment helped Darwin
develop his theory of adaptation
develop his theory of evolution
observe mimicry in nature
practice artificial selection
The flat line of this graph tells you that this population has reached its ______________________ in this community.
competition
biotic potential
carrying capacity
limiting factors
The need for organisms to rely on the same resources causes
competition
biotic potential
carrying capacity
population growth
The number of robins that hatch in a year is the population's ____________
biotic potential
birthrate
carrying capacity
exponential growth
Which is a limiting factor for a cottontail rabbit population in Maryland?
a large amount of food
a large amount of shelter space
an abundance of foxes in the area
an unpolluted river in the ecosystem
What does a population undergo when it has no limiting factors?
exponential growth
extinction
migration
population movement
What is the term for all species living in the same ecosystem at the same time?
biosphere
community
habitat
population
Which type of relationship includes mutualism and parasitism?
competition
cooperation
predation
symbiosis
What is eutrophication?
decreasing nutrients
decreasing salinity
increasing nutrients
increasing salinity
An ecosystem that is developing after a volcanic eruption is an example of
primary succession
secondary succession
Which organism would be the first to grow in an area that has been buried in lava?
grass
roses
oak tree
lichen and mosses
During aquatic succession, freshwater ponds
become saltwater ponds
fill will soil
gain organisms
increase in depth
