Unit 2: Part 5

A deer population in a forest grows rapidly, but then a drought causes water and food to become scarce. What will likely happen to the deer population?

• Population increases due to drought

• Population decreases due to limited resources

• Population stays the same

• Population moves to a new forest

How does homeostasis help an organism survive when temperatures drop suddenly?

• It helps keep internal body temperature stable

• It makes the organism move to a warmer place

• It causes the organism to stop all activity

• It changes the organism's genetic code

When wolves are removed from an ecosystem, the deer population explodes. Which concept explains why the deer population grows unchecked?

• Carrying capacity exceeded due to lack of predators

• Homeostasis is broken

• Limiting factors increase

• New species introduced

A population of fish in a lake is growing until a chemical spill reduces oxygen levels in the water. What kind of limiting factor is the chemical spill?

• Biotic limiting factor

• Abiotic limiting factor

• Positive growth factor

• Homeostatic factor

Why might two species that compete for the same limited food source not be able to both survive in the same habitat?

• Because of competition, one species may outcompete the other

• They will always cooperate to share food

• Limiting factors don't apply here

• Both species will increase in population

How does homeostasis relate to an organism’s response to a predator?

• It helps maintain internal stability despite stress

• It increases predator populations

• It causes the organism to lose control

• It makes the organism more visible

If a new disease spreads through a rabbit population, which limiting factor is directly affecting the population?

• Biotic limiting factor

• Abiotic limiting factor

• Carrying capacity

• Homeostasis

A population reaches its carrying capacity when resources are limited. Which outcome is expected next?

• Population stabilizes or decreases

• Population grows exponentially

• Population doubles every year

• Population becomes extinct immediately

How would removing a keystone predator affect the populations of herbivores and plants in an ecosystem?

• Herbivore populations increase, plants decrease

• Herbivore populations decrease, plants increase

• No effect on populations

• Both herbivores and plants increase

In hot environments, how do animals maintain homeostasis?

• By sweating or panting to cool down

• By drinking less water

• By stopping movement entirely

• By growing thicker fur