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Natuurwetenskappe

Lewe en lewenswyse

Opvoeders afdeling

Memorandum

  • Die tuinslak
  • Seekat en mossel
  • Spiervoet
  • twee paar voelers en twee oë
  • Die slak beweeg met golfbewegings in die spiervoet.
  • Die mond is T-vormig, aan die onderkant van die kop.

Opdragte:

1. Die plante na-aan die grondoppervlak sou waarskynlik welig groei. Die diere wat van slakke leef, soos honderdpote, voëls en muise, sou moontlik ander weivelde soek.

2.

Erdwurm Ronde langwerpige liggaam maak dit moontlik om gate in grond te grawe, plantreste in te dra en saam met grond te eet Leef in vogtige grond om vel vogtig te hou Stelsel van buisies waarmee die hoeveelheid water wat opgeneem en afgegee word, beheer word
Sprinkaan Kan beweeg om voedsel te soek. Bytende monddele om plantmateriaal fyn te sny Buisies vertak in liggaam, voorsien 'n vogtige gaswis-selingsoppervlak Uitwendige skelet verhoed waterverlies, kry vog saam met plantmateriaal in
Spinnekop ens. Leerders maak bloot 'n opsomming van inligting in teks.
Krap
Slak

3. Navorsingsopdrag: assesseer in terme van die raamwerk wat in die module verskaf word.

Leerder afdeling

Inhoud

Aktiwiteit: om die tuinslak te ondersoek en die aanpassing van enkele invertebrate ten opsigte van oorlewing te vergelyk [lu 1.1, lu 1.2, lu 1.3, lu 2.3, lu 2.4]

Die tuinslak

Die slak behoort tot die groep weekdiere of Mollusca . Kan jy nog onthou watter ander diere aan hierdie groep behoort?

Die _____________________________ en ________________________________

Jy sal dit nie moeilik vind om ‘n tuinslak in die hande te kry nie. Kyk na sy uitwendige bou en probeer om die volgende vrae te beantwoord:

Die grootste deel van die liggaam bestaan uit ‘n ______________________________ -voet.

Aan die kop is twee ___________________________________ en twee ____________________________________________________________________

Sit die slak op ‘n glasplaat neer en wanneer hy begin beweeg, kyk van onder af deur die glas en beskryf wat jy sien (hoe hy beweeg).

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

Kan jy sy mond sien? Beskryf. ___________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_____________________________________________________________________

_______________________________________________________________________________________________________________________________________________________________________________________________________________

Lig die slak op en probeer om langs die liggaam in die skulp in te kyk. Kan jy ‘n opening sien? Dit is die asemhalingsopening.

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Source:  OpenStax, Natuurwetenskappe graad 7. OpenStax CNX. Sep 16, 2009 Download for free at http://cnx.org/content/col11078/1.1
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