Arthropods Quiz

Arthropods are the most diverse group of animals. What fraction of all known animals do they represent?

• More than 1/2

• More than 3/4

• More than 1/4

• More than 2/3

Approximately how many species of arthropods are there?

• More than 500,000 species

• More than 1 million species

• More than 2 million species

• More than 750,000 species

On average, how many new species of arthropods are discovered every year?

• About 5,000 new species

• About 7,000 new species

• About 10,000 new species

• About 12,000 new species

What are the main features of an arthropod?

• Exoskeleton made of calcium, unjointed appendages, and segmented body parts.

• Exoskeleton made of chitin, jointed appendages, and segmented body parts.

• Endoskeleton made of chitin, jointed appendages, and unsegmented body parts.

• Exoskeleton made of chitin, unjointed appendages, and unsegmented body parts.

What is an exoskeleton?

• A hard internal structure that supports the animal's body

• An external skeleton that supports the animal's tissues against gravity

• A flexible outer covering that allows for easy movement in water

• A type of shell that animals use for protection from predators

What is the primary function of an exoskeleton in arthropods?

• To provide energy for the animal

• To act as a sensory organ

• To support the animal's tissues against gravity

• To aid in the digestion of food

How is chitin arranged in arthropods?

• In a single, solid layer

• In layers like a biological "plywood"

• As a liquid within the body cavity

• In a helical structure like DNA

Which of the following best describes the properties of chitin?

• Soft and flexible

• Tough and strong

• Brittle and weak

• Elastic and stretchable

How many groups are arthropods classified into?

• Three

• Four

• Five

• Six

What are the characteristics of the first group of arthropods mentioned?

• Extinct, top feeders, 2000 species

• Extinct, bottom feeders, 4000 species

• Extant, bottom feeders, 4000 species

• Extant, top feeders, 2000 species