The Ultimate Crustacean Quiz

By: HowStuffWorks.com Contributors

The Ultimate Crustacean Quiz
Image: iStockphoto.com/Steven Gibson

About This Quiz

The crustacean belongs to the same major division of the animal world as spiders, lobsters, shrimp and water flies. Take this quiz and learn more about how multi-faceted this group of creatures is.
What is the common factor uniting spiders, wood lice and crabs?
six legs
venomous stings when threatened
membership of same division of the animal world
They all belong to the same phylum or major division of the animal world.

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How many species of crustaceans are there?
25000
It is estimated that there are some 25,000 species.
5000
1000

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How many segments can there be in a crustacean's body?
less than 40
up to 50
The body can be made up of up to 50 segments.
60

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What is the cephalothorax?
extension of thorax
abdomen and thorax
head and thorax
It is a unit comprised of the head and the thorax.

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What is the chitin?
external skeleton
It is a hard substance covering the body and forming an external skeleton.
digestive system
sensory nerves

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As the crustacean grows, how does the chitin develop?
It hardens and expands.
The overlapping panels increase in number.
It is periodically shed and a new one grows.
The chitin does not grow -- it is shed and a new one grows.

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How does the crustacean find its way?
using appendages attached to the thorax
using its compound eyes
It has compound eyes with many lenses.
sensory nerves on the claws

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If the crustacean uses its claws for grasping and eating, how does it walk?
Claws are also used for walking.
The claws are used for grasping, eating and walking.
Walks on legs attached to abdomen.
It doesn't walk, it swims.

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How many segments does the body of the lobster have?
50
35
19
It belongs to the high society of crustaceans that have only 19 segments, unlike the lower class with up to 50 segments.

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What are Entomostraca?
They are the only crustaceans that are not flesh-eaters.
They are small crustaceans without distinct body segments.
They are smaller crustaceans without distinct body regions.
They are the only crustaceans that give birth to live young and not eggs.

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What is the ecological effect of larger, water dwelling crustaceans?
They help keep beaches and streams clean.
They are scavengers. They help keep the streams and beaches clean.
Their increasing numbers endanger the aquatic ecosystem.
The increased popularity of sea food decreases their numbers endangering the species.

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How do land-dwelling crustaceans contribute to agriculture?
They are vital to the fertilization of crops.
They prevent destruction of crops by insects and other pests.
Most are pests.
Most of these crustaceans are pests and as such their impact on agriculture is negative.

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What do lobsters, sandhoppers and wood lice have something in common?
All give birth to their eggs on dry land.
All have 19 body segments.
They all belong to the high society of crustaceans with 19 body segments.
All are exclusively herbivores.

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In what part of the world are barnacles a delicacy?
parts of Europe and South America
In parts of Europe and South America the barnacle is a delicacy.
China and Japan
India and Thailand

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For what type of cuisine is the crayfish the main ingredient?
Thai
Indian
Cajun
Crayfish are the main ingredient in spicy Creole and Cajun cuisines of Louisiana.

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Which marine creature enjoys a meal of krill?
sea bass
whales
Many whales find the krill to be a main source of nutrients.
lobsters

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What are the smallest crustaceans?
water fleas
The water flea can be as small as 1/125 inch (0.2 millimeter) long.
wood lice
pill bugs

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Of all the crustaceans, which are the most common?
pill bugs
krill
copepods
The most common are copepods, tiny organisms that swim or float.

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Are crustaceans in any danger?
All are in danger.
Most are not in danger.
Because most are small, numerous and widely distributed, there is no concern for their survival.
Only the fresh water ones are endangered.

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What is the average size of lobsters caught today?
20 pound (9 kilogram)
10 pound (4.5 kilogram)
1 pound (0.45 kilogram)
The average size is about 1 pound (0.45 kilogram) as opposed to 20 to 40 pounds (9 to 18 kilogram) in the past

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You Got:
/20
iStockphoto.com/Steven Gibson

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