6 ­ Inv. 3 Part 1 ­ meet the crayfish.notebook
October 28, 2012
Date
Meet the Crayfish
Focus Question: What structures do crayfish have? What are the
functions of those structures?
I predict that crayfish have eyes to see, legs to move, hands/snappers to grab stuff, and antenna to feel around. I predict Predictions:
that the pinchers are to pinch predators. I predict their tails are to make them move faster.
Materials: crayfish, container
Procedure: Observe a crayfish and identify its different
structures using the “Crayfish Structures” page. Label those
structures on the "Crayfish Diagram".
I learned that male and female crayfish are different. Claim: I claim that a female crayfish have 2 different structures than males.
Because female crayfish have an egg pore and long swimmerets, and Evidence: males have a modified swimmeret and short swimmerets. Also, males are usually bigger than females.
Conclusion: Crayfish have many different structures that each have its own function. Many structures are used to defend themselves.
Line of learning:
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6 ­ Inv. 3 Part 1 ­ meet the crayfish.notebook
October 28, 2012
pincer
carapace
long antennae
short antennae
tail
walking leg
eye
2
6 ­ Inv. 3 Part 1 ­ meet the crayfish.notebook
October 28, 2012
FEMALE
mouth
egg pore
long swimmeret
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6 ­ Inv. 3 Part 1 ­ meet the crayfish.notebook
MALE
October 28, 2012
mouth
modified swimmeret
short swimmeret
4
6 ­ Inv. 3 Part 1 ­ meet the crayfish.notebook
October 28, 2012
Vocab
structures - the observable parts of an organism
crustaceans - a class of mostly aquatic animals that have hard, flexible
shells, jointed legs, and two pairs of antennae
antennae - the feelers on a crayfish
bristles - the short hairs on the crayfish that help them sense things
in their environment
carapace - the main body shell of crustaceans
swimmerets - small, leglike structures under the tail
pincers - the big jointed leglike structures in the front of the
crayfish
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