Question 1

True or false: Tardigrades are technically bacteria, not animals, due to their simple cell structure.

Accepted Answer

False. Tardigrades are multicellular animals (eukaryotes) in the phylum Tardigrada, closely related to arthropods. They have complex organs, unlike bacteria.

Question 2

True or false: Most tardigrades are less than 1 millimeter long, making them invisible to the naked eye.

Accepted Answer

True. The average tardigrade is about 0.5 mm long. The largest species reaches just 1.5 mm, still barely visible without magnification.

Question 3

True or false: Tardigrades can survive the vacuum of space without any protection.

Accepted Answer

True. In 2007, tardigrades were exposed to the vacuum and radiation of space on a European Space Agency mission and survived, though some died from UV radiation.

Question 4

True or false: Tardigrades are the only known animal that can survive being completely frozen for decades.

Accepted Answer

False. Other animals like some frogs, turtles, and nematodes can also survive being frozen for long periods. Tardigrades are not unique in this ability.

Question 5

True or false: Tardigrades can survive boiling water at temperatures over 300 degrees Fahrenheit.

Accepted Answer

False. While hardy, tardigrades cannot survive boiling water. Their upper thermal limit is around 300°F (150°C) only in a dehydrated state, and not for long.

Question 6

True or false: Tardigrades enter a state called cryptobiosis where their metabolism drops to nearly zero.

Accepted Answer

True. When dehydrated, tardigrades curl into a tun and reduce metabolic activity to less than 0.01% of normal, allowing them to survive extreme conditions.

Question 7

True or false: Tardigrades have a complete digestive system that includes an anus.

Accepted Answer

True. Despite their microscopic size, tardigrades have a full digestive tract with a mouth, pharynx, intestine, and anus, allowing them to eat and excrete waste.

Question 8

True or false: Tardigrades have been found living on the Moon after a spacecraft crash.

Accepted Answer

False. No tardigrades have been confirmed on the Moon. Some were on a crashed Israeli lander in 2019, but their survival is highly unlikely and unverified.

Tardigrade Trivia Questions