Keystone Test Keystone Biology: Ecology and Homeostasis

Question 1

What is homeostasis?

Accepted Answer

The maintenance of a stable internal environment

Answer

Homeostasis is the ability of an organism to maintain stable internal conditions despite external changes.

Question 2

Which organ system is primarily responsible for maintaining body temperature in humans?

Accepted Answer

Integumentary system

Answer

The integumentary system (skin, sweat glands) helps regulate body temperature through sweating and blood vessel changes.

Question 3

What is a food web?

Accepted Answer

A complex network of feeding relationships in an ecosystem

Answer

A food web shows multiple overlapping food chains and the complex feeding relationships among organisms.

Question 4

Which level of the energy pyramid contains the MOST available energy?

Accepted Answer

Producers

Answer

Producers (plants) capture solar energy and have the most energy available in the pyramid.

Question 5

What is the role of decomposers in an ecosystem?

Accepted Answer

Breaking down dead organisms and recycling nutrients

Answer

Decomposers like fungi and bacteria break down dead matter and return nutrients to the soil.

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