7th Grade Review Part 2

7.7 Which animal's disappearance would have the greatest effect on the competition between the wolf, lynx, and bear?

• Salmon

• Elk

• Weasel

• Woodpecker

7.7 An area that an animal defends from other members of the same species is called its ___.

• territory

• society

• niche

• habitat

7.7 How does an animal's position in the food web affect its interactions among individuals of a population? (3 answers)

• Primary consumers compete with each other for the same food source.

• When a secondary consumer's population decreases, at least one or more of the primary consumer populations will increase.

• Tertiary and secondary consumers cooperate in order to protect each other from other predators.

• Since rain is sparse, the producers are often in competition for water.

7.7 Which is the best example of two animals behaving cooperatively together?

• Lemurs will take care of infants that are not related to them.

• A tick feeds on the blood of a dog.

• A hermit crab uses a snail shell for a home.

• The sea anemone protects the clown fish from predators while the clown fish attracts food for the sea anemone.

7.8 If humans interfered by spraying an insecticide to kill the insects, what would be the next thing that would happen?

• The number of songbirds would decrease.

• The number of grass plants would decrease.

• The number of snakes would increase.

• The number of hawks would increase.

7.8 All of the following are primary consumers except ____.

• foxes

• rabbits

• birds

• grasshoppers

7.8 Which is the best prediction for the wolf population in 2009?

• 25

• 50

• 700

• 2000

7.8 In the relationship between a snake and a frog, if the snake eats the frog, the frog is ___.

• prey

• a predator

• alpha

• a mutualistic partner

7.8 Cheetahs and lions both feed on similar prey. What does this create?

• Competition between the two species for food.

• Cooperation between the two species for food.

• Niches between the two species for food.

• Producers between the two species for food.

7.8 Which example shows cooperation between species?

• a bird eating insects and parasites off of a buffalo's body.

• a vulture stealing the prey that was killed by a cheetah.

• a chipmunk gathering nuts before a squirrel gets them.

• a weed overgrowing a plant in a flower garden.