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Science – lesson #5 what group of organisms is the most numerous ? . Outcomes ( 205-7) and (300-18). What is an a rthropod ?. http://evolution.berkeley.edu/evolibrary/article/_0/arthropods_01 What are characteristics common to arthropods ? . Vocabulary to know.

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science lesson 5 what group of organisms is the most numerous

Science – lesson #5 what group of organisms is the most numerous ?

Outcomes ( 205-7) and (300-18)

what is an a rthropod
What is an arthropod ?
  • http://evolution.berkeley.edu/evolibrary/article/_0/arthropods_01
  • What are characteristics common to arthropods ?
vocabulary to know
Vocabulary to know
  • Arthropod: an animal that has an exoskeleton and three or more pairs of jointed legs
  • Exoskeleton: a hard outside covering of an animal that has no skeleton inside its body
  • Identification key: a set of questions, descriptions, and/or pictures that guide you through a process of identifying an organism.
who are they
Who are they ?
  • Arthropod means “jointed foot”
  • They have a hard external skeleton covering the whole body ( including legs)
  • And a segmented body
  • Arthropods might be lobsters, centipedes spiders and insects
adaptations
adaptations
  • One of the reasons there are so many of them is the adaptations to their environments.
  • They live almost anywhere
  • Exoskeletons protect them from enemies and prevent moisture loss ( they shed their exoskeletons and grow new ones)
how to sort them out classify
How to sort them out (classify)
  • Since there are so many kinds of arthropods scientist use an identification key to sort them out.
  • If you compare descriptions with the organism you are observing you refine your search and narrow down to a single species or class.
  • Turn to page 18 in the student book , read the opening paragraph and then the questions in the exploration.
questions for identification key
Questions for identification key
  • How many legs ?
  • What are their bodies like ?
  • How many body sections do they have ?
  • Do they have eyes ? How many ?
  • Do they have antennae ? How many ?
  • What other structure do they have ?
hard exoskeleton
Hard exoskeleton ?

With

without

Worm

  • Butterfly
  • Bee
  • Dragon fly
  • Scorpion
  • Centipede
  • Snail
  • Grasshopper
  • Crab
  • Ant
  • spider
number of legs
Number of legs ?

3 pair or more

Less than 3

of body sections
# of body sections ?

Three or more

Less than 3

eyes antennae
Eyes ? Antennae?

Two or more

none

in your groups
In your groups…
  • Use the arthropod samples and pictures provided for your group.
  • Make up charts using the identification key ( the questions) to classify your samples.
  • Each person hands in his/her own chart/table
done try these
Done ? Try these
  • http://evolution.berkeley.edu/evolibrary/article/arthropodstory
  • http://www.biologyjunction.com/arthropods.htm
  • http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/understanding_environment/classificationrev3.shtml
  • No net book ? Look on page 20 and classify those creatures.
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