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B7: Quiz 2 – Answers
B7: Quiz 2 – Answers
1)
a) Sunlight, space, water and mineral ions
b) Food, mates, water and tertiary
c) True
2)
a) A stable community is a community where all of the species and environmental factors are in balance, which results in the populations of all of the different organisms remaining fairly constant
b) Interdependence
3)
a)
i) Grasshoppers
ii) Frog
iii) Grass
b) Fewer frogs means that there are fewer predators for the grasshoppers, which means that less grasshoppers get eaten, which causes the population of grasshoppers to increase. As the population of grasshoppers increases, they will eat more of the grass, which results in the population of grass decreasing. So, the population of grasshoppers increases and the population of grass decreases.
4) An event that causes the population of mice to decrease means that less corn is being eaten by the mice, which results in the population of corn increasing. If there are less mice, there is less food available for the owls, which means that the population of owls will decrease. So, the population of corn increases and the population of owls decreases.
a) Sunlight, space, water and mineral ions
b) Food, mates, water and tertiary
c) True
2)
a) A stable community is a community where all of the species and environmental factors are in balance, which results in the populations of all of the different organisms remaining fairly constant
b) Interdependence
3)
a)
i) Grasshoppers
ii) Frog
iii) Grass
b) Fewer frogs means that there are fewer predators for the grasshoppers, which means that less grasshoppers get eaten, which causes the population of grasshoppers to increase. As the population of grasshoppers increases, they will eat more of the grass, which results in the population of grass decreasing. So, the population of grasshoppers increases and the population of grass decreases.
4) An event that causes the population of mice to decrease means that less corn is being eaten by the mice, which results in the population of corn increasing. If there are less mice, there is less food available for the owls, which means that the population of owls will decrease. So, the population of corn increases and the population of owls decreases.
Questions
1)
a) Give 4 things that plants compete with each other for.
b) Give 4 things that animals compete with each other for.
c) Is the statement below true or false?
“Organisms compete for resources with members of their own species and other species”
2)
a) Give a definition of a stable community.
b) All organisms in an ecosystem depend on each other for food, shelter, pollination and seed dispersal; what single word do we use to describe the relationship between all of the organisms in an ecosystem?
3) We have the food chain below.
1)
a) Give 4 things that plants compete with each other for.
b) Give 4 things that animals compete with each other for.
c) Is the statement below true or false?
“Organisms compete for resources with members of their own species and other species”
2)
a) Give a definition of a stable community.
b) All organisms in an ecosystem depend on each other for food, shelter, pollination and seed dispersal; what single word do we use to describe the relationship between all of the organisms in an ecosystem?
3) We have the food chain below.
a) Give the names of the following:
i) Primary consumer
ii) Secondary consumer
iii) Producer
b) There is a virus that causes the population of frogs to decrease. Predict what effect this will have on the population of grass and grasshoppers. Explain your answer.
4) We have the food chain below.
i) Primary consumer
ii) Secondary consumer
iii) Producer
b) There is a virus that causes the population of frogs to decrease. Predict what effect this will have on the population of grass and grasshoppers. Explain your answer.
4) We have the food chain below.
An event causes the population of mice to decrease. Predict what effect this will have on the population of corn and owls. Explain your answer.