A beak like extension of the crayfish's head is called...
the rostrum
100
The middle flipper of the crayfish tail is called...
the telson
100
When you treat a living thing in a way that keeps it from suffering, it is called...
humane treatment
100
A crayfish molts once a month to grow more legs.
False... Crayfish molts in order to grow larger.
100
How does a crayfish act when upset or frightened?
A crayfish will swim backwards quickly using its tail. It will take a defensive position in which he or she will stand on its walking legs and lift its pincers.
200
The portion of the crayfish body located between the head and abdomen is called
the thorax
200
A crayfish has 8 limbs, four on each side, called...
walking legs
200
A living thing that eats dead plants and animals is called a...
scavenger
200
Crayfish can live out of water for short periods of time.
True... They can stay out of water for short periods of time as long as their gills stay wet so they can breathe.
200
How do crayfish breathe?
Crayfish have gills located in a chamber along the sides of the cephalothorax, under the carapace. Both ends of the chamber are open so that water can enter near the tail end and leaves near the mouth.
300
The part of a crayfish mouth that is used to pierce food is called
mandibles
300
One of the sensory parts on the head of insects and crustaceans are called...
an antennae
300
One of the conditions in an experiment that can affect the results is called a...
variable
300
A male crayfish is always larger than a female crayfish.
False... you need to examine the swimmerets in order to determine the gender of the crayfish.
300
What is regeneration?
Through the molting process, a crayfish has the ability to regrow any lost legs or claws. A regenerated part is usually noticeably smaller than a paired limb that has not been lost or re-grown.
400
Small limbs underneath a crayfish's abdomen that moves water to help breathing and are used by females to carry eggs are called
swimmerets
400
The side flaps of a crayfish's tail are called...
uropods
400
A change in the environment that causes a living thing to do something is called a...
stimulus
400
Hair color and the ability to roll your tongue are examples of acquired traits.
False... they are both examples of inherited traits.
400
How can you determine the gender of your crayfish?
The first two pairs of swimmerets on male are fused together and lie between his walking legs.
500
This body part is located behind the mandible and they help the crayfish to ingest food. They are called...
maxillae
500
The hard exterior shell of a crayfish is called...
carapace or exoskeleton
500
A class of arthropods including crabs, lobsters, crayfish, and barnacles that have segmented bodies, shell-like exoskeleton, and paired, jointed limbs are called...
crustaceans
500
The life expectancy of a crayfish is 1-4 years.
True
500
Crayfish use their senses in a variety of ways. Name the four ways that they are used.
Crayfish use its senses to test the environment continually to find food, shelter, a mate, and to avoid enemies and unfavorable surroundings.