WorksheetsPopulations & Resources: Chap. 1 & 2
Total questions: 20
Worksheet time: 13mins
Glucose is an example of ....?
A molecule
An atom
Never heard of that word
An energy storage molecule
When something remains mostly the same over time it is said to have....?
Uneventful
Potential Energy
Stability
Boring
A ________________________________ is all the living and non-living things interacting in a particular area.
Population
Ecosystem
Sample
Organisms
Living things such as plants, animals and bacteria are.....?
Populations
Organisms
Ecosystems
Resource Populations
A small part that is meant to show what the whole is like...?
A piece of something
A fraction
A sample
Competition
An example of stability would be.....?
An increase of births and a decrease of deaths
An increase of deaths and a decrease of births
Both births and deaths are equal
Both births and deaths are unequal
A population of tigers lives in Bangladesh. Over 30 years, the size of the tiger population increased. What best explains the increase in size of the tiger population?
A lot of tigers were born and none of them died
The tiger population is always increasing because no animal eats tigers
Fewer tigers were born than died
More tigers were born than died
A population of mice lives in the northeastern United States. Over the past 40 years, the size of the mouse population decreased. What best explains the decrease in the size of the mouse population?
Fewer mice were born than died
A lot of mice died and no new mice were born
More mice were born than died
The mouse populations is always decreasing because mice are always being eaten
In the Arctic region, polar bears eat seals, and seals eat cod(fish). The past 5 years the sizes of all populations were stable, but recently the size of the polar bear population decreased. What will probably happen to the cod(fish) population?
Increase
Stay the same
Decrease
Not sure
An indirect effect is when.....?
When several causes lead directly to several effects
When nothing is effected
When a caterpillar may exert a direct effect on a plant by eating it.
The result of one cause leading to an effect that causes one or more effects
The sockeye salmon require a lot of energy during reproduction due to.....?
Jumping 12 feet over water falls to get to their laying grounds
Digging 4 or 5 gravel nests at the bottom of the stream to lay their eggs
Females fighting other females to get the best nesting spots
Laying 1,200 eggs in each nest
What do birds such as eagles and hawks need energy for?
digesting food
breathing
flying
all of the above
A population of deer lives in Canada. Over 50 years, the size of the deer population decreased. What best explains the decrease in the size of the deer population?
More deer were born than died.
The deer population is always decreasing because deer are always being eaten.
A lot of deer died and no deer were born.
Fewer deer were born than died.
A large population of squirrels lives in a forest. In the last 50 years, the size of the squirrel population has stayed the same. What must be true about the squirrel population during the last 50 years?
No squirrels were born and no squirrels died.
Humans started protecting the squirrel population so they stopped dying.
The squirrels did not have any baby squirrels during these years.
The number of squirrels that were born was the same as the number of squirrels that died.
A population of sharks lives in the Atlantic Ocean. Over the last 50 years, the size of the shark population increased. What best explains the increase in the size of the shark population?
More sharks were born than died.
The shark population is always increasing because no animal eats sharks.
A lot of sharks were born and no sharks died.
Fewer sharks were born than died.
In a rainforest, both spiders and frogs eat flies. The sizes of the populations have been stable for the last 10 years, but recently the size of the frog population decreased. What will likely happen to the spider population?
The size of the spider population will . . .
increase. The smaller frog population will leave more energy storage molecules for all other populations in the ecosystem, so all populations will reproduce more. This will lead to more births in the spider population.
stay the same. Frogs and spiders do not eat each other, so the number of births and deaths in the spider population will stay the same.
increase. More energy storage molecules will be available to the spider population from the larger fly population, so the spider population will reproduce more. This will lead to more births than deaths in the spider population.
decrease. A decrease in the size of one population leads to a decrease in the sizes of all other populations in an ecosystem.
Scientists have been studying the size of three populations in a river in Ireland. In this ecosystem, pike (a type of big fish) eat perch (a type of small fish), and perch eat snails. The data showed that all three populations were stable. Then the snail population increased suddenly. What will likely happen to the size of the perch population as a result?
The size of the perch population will . . .
increase. An increase in any population within an ecosystem will lead to an increase in the sizes of all other populations in the ecosystem.
stay the same. The size of its consumer population did not change, so the number of deaths in the perch population did not change. There will be the same number of births and deaths in the perch population.
increase. The larger snail population will provide more energy storage molecules for the perch population, so they will reproduce more. This will lead to more births than deaths in the perch population.
decrease. The larger snail population will take more energy storage molecules from the ecosystem, leaving fewer available for the perch population. This will lead to more deaths than births in the perch population.
In the northwestern United States, both coyotes and wolves eat deer. The sizes of the populations have been stable for the last 6 years, but recently the size of the wolf population increased. What will likely happen to the coyote population?
The size of the coyote population will . . .
decrease. Fewer energy storage molecules will be available to the coyote population from the smaller deer population, so the coyote population will reproduce less. This will lead to fewer births than deaths in the coyote population.
decrease. The larger wolf population will leave fewer energy storage molecules for all other populations in the ecosystem, so the coyote population will reproduce less. This will lead to fewer births in the coyote population.
increase. An increase in the size of any population leads to an increase in the sizes of all other populations in an ecosystem.
stay the same. Coyotes and wolves do not eat each other, so the number of births and deaths in the coyote population will stay the same.
Scientists have been studying the size of three populations in a grassland. In this ecosystem, snakes eat rats, and rats eat grasshoppers. The data showed that all three populations were stable. Then the grasshopper population decreased suddenly. What will likely happen to the size of the rat population as a result?
The size of the rat population will . . .
increase. The smaller grasshopper population will need fewer energy storage molecules so there will be more energy storage molecules available for the rat population to reproduce. This will lead to more births in the rat population.
decrease. The smaller grasshopper population provides fewer energy storage molecules for the rat population, so the rat population will reproduce less. This will lead to fewer births than deaths in the rat population.
stay the same. The size of their consumer population did not change, so the number of deaths in the rat population did not change. There will be the same number of births and deaths in the rat population.
decrease. A decrease in any population leads to a decrease in the sizes of all other populations in the ecosystem.
Scientists have been studying the size of three populations along the coast of Antarctica. In this ecosystem, penguins eat sardines (a type of small fish), and sardines eat zooplankton (very small animals that live in water). The data showed that all three populations were stable. Then the penguin population decreased suddenly. What will likely happen to the size of the sardinepopulation as a result?
The size of the sardine population will .
increase. The smaller penguin population will need fewer energy storage molecules, so they will eat fewer sardines. This will lead to fewer deaths than births in the sardine population.
increase. The smaller penguin population will leave more energy storage molecules available for the sardine population to reproduce more. This will lead to more births in the sardine population.
decrease. A decrease in one population causes a decrease in the sizes of all other populations in the ecosystem.
stay the same. The size of its resource population did not change, so the amount of energy storage molecules available for the sardines did not change. There will be the same number of births and deaths in the sardine population.
