WorksheetsWhy Populations Change Over Time
Total questions: 20
Worksheet time: 12mins
Natural Selection cannot occur without...
competition for unlimited resource
gradual warming of earth
genetic variation in species
asexual reproduction in species
Which factor will most likely increase the survival chances of an organism living in an environment that is undergoing rapid changes?
encountering strong competition
having a long life span
producing identical offspring
having a diverse gene pool
Diversity among members of a species is important because diversity....
ensures high levels of competition
increases he available ecosystem resources
ensures the variety of reproductive methods for a species
increases the chances of survival under changing conditions
Which is most likely responsible for the chinch bugs' ability to survive repeated exposure to insecticides?
species diversity
genetic diversity
ecosystem diversity
population diversity
One rabbit runs faster than other rabbits in its population. How will the ability to run fast most likely benefit the rabbit?
by keeping the rabbit warmer in winter
by making it easier for the rabbit to escape from predators
by allowing the rabbit to find more sources of food
by helping the rabbit blend in with its environment
Dalmatian dogs sometimes become deaf due to a recessive trait they may inherit. For this reason, some Dalmatian owners will not let their dogs have puppies if they are deaf. Allowing only Dalmatians that can hear to produce offspring is an example of...
Selective breeding
Sexual reproduction
Cross breeding
Learned traits
Based on the picture and chart, which characteristic are these three types of poodles specifically bred for?
Size
Color
Coat length
Retrieving ability
Researchers breed plants to produce crops that have helpful traits. One of these traits is the ability to grow where there is little moisture. How would this trait most likely benefit farmers?
It allows crops to survive without fertilization
It allows crops to be grown in drier climates
It allows crops to be unaffected by disease
It allows crops to survive in areas with fewer seasons
The Great Pyrenees is a breed of dog that has long, white, water-resistant hair with a shorter, thick undercoat. They are able to withstand extremely cold temperature in mountainous regions. The neck of the dog is strongly muscled, with a thick skin and extra hair.
These dogs are most likely bred for...
sniffing out drugs at airport terminals
protecting livestock from predators
retrieving small game from desert burrows
assisting law enforcement workers in protecting property
Some dairy farmers want their cows to produce greater amounts of milk than average cows. Which process will help the dairy farmers develop cows with this trait?
Geographical isolation
ecological succession
behavioral modification
selective breeding
Which statement best describes the theory of natural selection?
It happens over a long period of time
It requires the individuals to be identical
It increases the size of a population
It guarantees the survival of a species
The flow chart shown describes the process of natural selection. Which statement best completes the empty box in the flowchart?
Natural selection eventually stops as a population becomes more limited
Overpopulation naturally follows as a consequence of natural selection
As only a few organisms survive, populations will eventually die out
As environmental pressure constantly change, adaptations of organisms continue
Several kinds of birds live on a small island. A storm destroys most of the plants on which the bords feed and build their nests. Which kind of bird is most likely going to survive on the island?
The birds that have the greatest number
The birds that are most able to adapt
The birds that can fly the farthest
The birds with the strongest beaks
A species with highly specialized traits is most likely vulnerable to extinction because...
small changes in its habitat can affect its ability to survive
it is able to adapt quickly to extreme weather conditions
it is able to eat a wide variety of foods from the environment
it cannot survive without enough water
Polar bears are well adapted to the Arctic environment due to their white fur coats. Which statement best explains why white coat color was possibly favored by natural selection over other coat colors?
Polar bears choose mates with the whitest coat color
Polar bears with white coats are better camouflaged
The white-coat color is able to capture more heat
The white-coat color attracts more prey
"Survival of the fittest."
The image shows light and dark colored moths that live on a tree. Which result is most likely to occur to the moth population over time due to predation?
The number of light colored moths in the population will increase
There will be more dark colored moths than light colored moths
The number of light colored moths will decrease
The dark colored moths will move to a different type of tree
Why is the mouse population changing over time?
The light mice can reproduce more successfully than the dark mice
The hawks eat more dark mice than light mice because the dark mice taste better
The hawks eat more light mice than dark mice because they can see the light mice more easily
The hawks eat more dark mice than light mice because they can see the dark mice more easily
Of the four parts of natural selection, which is this an example of?
