greycollegesecondary.com · Web viewDie onderstaande apparaat word in verskeie organiese voedseltoetse gebruik. 3.1 Noem die voedingstowwe waarvoor in elk van die eksperimente wat

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KWARTAAL 1LEWENSWETENSKAPPE PRAKTIESE ONDERSOEKELET WEL : Hierdie ondersoeke word deur die Onderwysdepartement voorgeskryf. Hierdie of soortgelyke vrae kan in enige Toets of Eksamenvraestel van Grey of die Departement gevra word. Sommige ondersoeke het die antwoorde se bladsye onder aan wat in die Antwoord Reeks verkry kan word. Ondersoeke waar daar geen antwoorde is nie moet jy self opsoek in jou handboeke of ander bronne.

Ondersoeke 1-4Die onderstaande apparaat word in verskeie organiese voedseltoetse gebruik.

3.1 Noem die voedingstowwe waarvoor in elk van die eksperimente wat A tot D genommer is, getoets word.

A : ___________________________________________________________

B : ___________________________________________________________

C : ___________________________________________________________

D : ___________________________________________________________

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3.2 Identifiseer die chemikalieë wat 1 tot 3 genommer is. 1 : ___________________________________________________________

2 : ___________________________________________________________

3 : ___________________________________________________________

3.3 Noem die kleurverandering vir ‘n positiewe reaksie by elk van die proefbuise wat gebruik word in die eksperimente genommer A tot D.

A : ___________________________________________________________

B : ___________________________________________________________

C : ___________________________________________________________

D : ____________________________________________________________

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Ondersoek 5.1

24.1 Watter eienskappe van ensieme word ondersoek ?

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24.2 Hoe verskil die resultaat van tafeldoek 1 van dié van tafeldoek 3, nadat dit gewas is ?

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24.3 Gee ‘n rede vir die antwoord in VRAAG 24.2.

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24.4 By watter moontlike temperatuur is elk van die volgende tafeldoeke gewas ?

24.4.1 2 _______________________________________________________

24.4.2 3 _______________________________________________________

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24.5 Watter ensiem mag moontlik in die waspoeier teenwoordig wees ? Gee ‘n rede vir jou antwoord. ______________________________________________________________ ______________________________________________________________

Antwoorde : bl. 1.67

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Ondersoek 5.2

26.1 Wat is die name van die twee onskadelike produkte waarin waterstofperoksied afgebreek word ? _______________________________________________________________

26.2 Katalase is ‘n ensiem. Wat is die funksie van ‘n ensiem ?

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26.3 Watter voordeel hou hierdie funksie, in Vraag 26.2 genoem, by hierdie spesifieke reaksie vir die mens in ?

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26.4 Hoe kry die ensiem dit reg om sy funksie, soos in Vraag 26.2 genoem, te verrig ?

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26.5 Word die ensiem in die proses deur die giftige stof vernietig, of sal dit weer in ‘n volgende reaksie ‘n rol kan speel ?

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26.6 Watter waarneming sou op ‘n positiewe reaksie van die katalase dui ?

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26.7 In watter een van die proefbuise A,B of C sou die reaksie die vinnigste plaasvind ? Gee ‘n rede vir jou antwoord.

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26.8 Verduidelik, met redes, die waarnemings in proefbuise A en B onderskeidelik.

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26.9 Indien jy hierdie ondersoek moes uitvoer, formuleer ‘n hipotese vir die eksperiment.

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26.10 Noem vir hierdie eksperiment, die

26.10.1 afhanklike veranderlike ________________________________________

26.10.2 onafhanklike veranderlike ______________________________________

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26.10.3 vaste veranderlike (s) __________________________________________

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26.11 Wat sou die resultaat in proefbuis C wees, indien die hoenderlewer vooraf gekook is ? Gee’n rede vir jou antwoord.

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Anwoorde : bl. 1.67

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Ondersoek 6.1

2.1 Identifiseer die dele wat 1 tot 13 genommer is.

1 __________________________________________________________________

2 ___________________________________________________________________

3 ___________________________________________________________________

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5 ___________________________________________________________________

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12 ____________________________________________________________________

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Antwoorde : bl. 1.69

Ondersoek 6.2

Teken die struktuur van ‘n plantsel (nat montering van ‘n ui epidermis) :

Teken die struktuur van ‘n diersel (wang epiteel) :

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Ondersoek 6.3

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3.5.1 Wat is die hoogste vergroting wat jy met hierdie mikroskoop kan kry ?

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3.5.3 Hoeveel selle van dieselfde grootte sal oor die deursnee van hierdie mikroskoopveld kan inpas ?

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3.5.4 Wat sal die geskatte grootte van elke sel (in mikrometer) wees ?

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3.5.5 Wat sal die geskatte deursnee van die mikroskoopveld onder die hoë vergroting wees ?

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3.5.6 Hoeveel selle sou onder die hoë vergroting in die mikroskoopveld waargeneem kan word ?

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Antwoorde : bl. 1.69- 1.70

Ondersoek 7

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Antwoorde : bl 1.70

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ONDERSOEK 8

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Ondersoek 9

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Ondersoek 12Identifiseer die onderstaande plantweefsels :

A _______________________________________________________________________

B _______________________________________________________________________

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C ______________________________________________________________________

D ________________________________________________________________________

E _______________________________________________________________________

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F ________________________________________________________________________

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G _________________________________________________________________________

H _______________________________________________________________________

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ONDERSOEK 10 Identifiseer die onderstaande dierweefsels :

A ________________________________________________________________________

B ________________________________________________________________________

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C _____________________________________________________________________

D ______________________________________________________________________

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E _____________________________________________________________________

F __________________________________________________________________________

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H _______________________________________________________________________

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I _______________________________________________________________________

J ________________________________________________________________________

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K ______________________________________________________________________

L ________________________________________________________________________

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M ________________________________________________________________________

ONDERSOEK 11

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19.1 Definieer die term kloning.

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19.2 Onderskei tussen DRIE tipes kloning.

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19.3 Noem die tipe reproduktiewe kloning wat gebuik is om Dolly tot stand te bring.

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19.4 Waarom was dit nodig om die selkern van die eiersel van die tweede skenker te verwyder, voordat die skaap gekloon kon word.

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19.5 Sal Dolly kenmerke van die eerste of die tweede skenkerskaap hê ?

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19.6 Die byskrif van nommer 5 op die voorstelling is “ Die embrio is gekweek “. Deur watter tipe seldeling ontwikkel die embrio ?

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19.7 Gee DRIE standpunte teen kloning van die mens.

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