2026 End Of Year Science Vocabulary Competition Practice Test

Which organ covers and protects the body from germs and bacteria and helps regulate body temperature?

Skin Organ Skeleton Lungs

Correct Answer:

Skin

Explanation:

The skin is the body's outer covering that acts as a protective barrier against germs and bacteria. It also helps regulate body temperature through sweat production and by adjusting blood flow to the surface. Sweat cools the body as it evaporates, while more blood flow to the skin releases heat and less blood flow conserves heat. The skin also contains immune cells that help detect invaders. The other options don’t fit as the primary defenders or regulators: a generic organ isn’t specific, the skeleton mainly supports and protects but doesn’t control temperature or defend against germs, and the lungs are key for breathing rather than serving as the main barrier or temperature regulator.

Access more questions from this quiz

Continue to 2026 End of Year Science Vocabulary Competition Practice Test for more practice questions and the full quiz experience.

Access More Questions