Populations And Communities Part 2 Question Preview (ID: 23767)


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Use an example to explain how a limiting factor can prevent a population from increasing indefinitely.
a) Turtles produce 100s of babies and all of them make it to the water.
b) Scarcity of food will eventually stop a population from growing because not enough food to feed more of the species.
c) Salmon swim upstream to lay their eggs.
d) Birth rate and death rate are always equal.

Identify an example of parasitism, and describe the interaction between the two species.
a) Wolves (parasites)chase rabbits (host) because they just enjoy the challenge in a parasitism relationship.
b) Wolves (parasites)chase rabbits (host) to eat them in a parasitism relationship.
c) A flea (host) gets its nutrition from a dog (parasite) in a parasitism relationship.
d) A flea (parasite) gets its nutrition from a dog (host) in a parasitism relationship.

Explain why parasites usually do not kill their hosts.
a) Parasites don't usually kill their host because they are too small.
b) Parasites don't usually kill their host because if they do, they must find a new host to survive.
c) Parasites don't usually kill their host because the host kills them.
d) Parasites don't usually kill their host because the host is too powerful.

If a pheasant population was introduced to a large grassy island with no predators, explain what might happen to their population over the next 10-120 years.
a) The population would start reproducing and the population would grow exponentially until the carrying capacity was reached.
b) The population would stay the same.
c) The population would decrease quickly because they are scared.
d) The population would start reproducing and the population would grow exponentially forever.

If the pheasant population grew for awhile, leveled off, and then started decreasing quickly, what are some reasons it might began decreasing.
a) Scarcity of food, water, or living space is the only reason populations decrease.
b) Disease is the only reason populations decrease.
c) New predator is the only reason populations decrease.
d) Scarcity of food, water, or living space; disease; climate change; or new predator introduced

In the winter, a family of coyotes crossed over to the island on the frozen lake. What do you think happened to the pheasant population.
a) The pheasant population will stay the same because they have good camouflage.
b) The pheasant population will stay the same because they can stay in the trees.
c) The pheasant population will decrease because of a new predator.
d) The pheasant population will increase because they can lay more eggs.

In an ecosystem, ducks, raccoons and turtles all live there. Explain what interactions do you thing will take place.
a) Ducks will prey on the raccoon babies.
b) Raccoons will eat the duck and turtle eggs.
c) Turtles will eat the duck's eggs.
d) Turtles will prey on the raccoon babies.

If the duck population decreased, what do you think will happen to the other two populations?
a) The raccoon population would stay the same or go down slightly, but the turtle population will decrease dramatically.
b) The turtle population would stay the same or go down slightly, but the raccoon population will decrease dramatically.
c) The raccoon and turtle population would increase.
d) The raccoon and turtle population would decrease.

If the turtle population decreased, what do you think will happen to the other two populations?
a) The raccoon and duck population would increase.
b) The raccoon and duck population would decrease.
c) The duck population would stay the same or go down slightly, but the raccoon population will decrease dramatically.
d) The raccoon population would stay the same or go down slightly, but the duck population will decrease dramatically.

If the raccoon population decreased, what do you think will happen to the other two populations?
a) The turtle and duck population would increase.
b) The turtle and duck population would decrease.
c) The duck population would increase, but the turtle population will decrease.
d) The turtle population would increase, but the duck population will decrease.

Some prey species blend with their surroundings while others are brightly colored. How can these defenses help species to survive? Choose the best answer.
a) The brightly colored species can hide from predators. The blended species are usually distasteful or poisonous.
b) The blending species can hide from predators. The brightly colored species can usually fly.
c) The blending species can hide from predators. The brightly colored species are usually distasteful or poisonous.
d) The blending species can usually fly. The brightly colored species are usually distasteful or poisonous.

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