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

  • http://evolution.berkeley.edu/evolibrary/article/_0/arthropods_01

  • What are characteristics common to arthropods ?


Vocabulary to know
Vocabulary to know numerous ?

  • 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 ? numerous ?

  • 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 numerous ?

  • 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) numerous ?

  • 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 numerous ?

  • 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 ? numerous ?

With

without

Worm

  • Butterfly

  • Bee

  • Dragon fly

  • Scorpion

  • Centipede

  • Snail

  • Grasshopper

  • Crab

  • Ant

  • spider


Number of legs
Number of legs ? numerous ?

3 pair or more

Less than 3


Of body sections
# of body sections ? numerous ?

Three or more

Less than 3


Eyes antennae
Eyes ? Antennae? numerous ?

Two or more

none


In your groups
In your groups… numerous ?

  • 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 numerous ?

  • 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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