Ecosystems Part 2

As the population of prey decreases, the population of the predator which eats it will ---

• Increase.

• Decrease.

• Remain constant.

Short Answer on Test: Why will having fewer insects affect the mice?

• The mice will not have enough insects to eat.
• It will not affect the mice.
• The mice will have too many insects to eat.

Short Answer on the Test: What would happen if all of the carrots died in the food chain?

• The rabbits would have too much to eat.
• The rabbits would not be able to eat carrots.

Observe the food chain above. Which organism’s population would increase if finches were removed from the ecosystem?

• Grass

• Grasshopper

• Snake

• Hawk

The roadrunner is a desert bird that eats fruits and seeds. It also eats insects, spiders, scorpions, and rattlesnakes.

What would likely happen if the roadrunner population disappeared from its ecosystem?

• There would be no more fruits or seeds.

• There would a decrease in spider populations.

• The rattlesnake population would stay the same.

• There would be an increase in scorpion populations.

The diagram shows a grassland food chain. If the mice are removed from this food chain, which animal population would most likely be affected first?

• Plant Seeds

• Field Mice

• Snakes

• Mountain Lions

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.
• There would be a decrease in the grass/flowers population.
• There would be a decrease in the mice population.
• There would be an increase in the grass/flowers population.

What may happen if the snowshoe hare was removed from the food web pictured?

• The insects in the habitat would increase.
• The shrew population would decrease due to being only hawk food source.
• The willow tree population would decrease.
• Foxes would dies due to no food source. 

If a disease strikes the snakes the rabbits will

• increase

• decrease

• not be affected

If a disease strikes the snakes the hawks will

• increase

• decrease

• not be affected