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Natuurwetenskappe

Ekosisteem en omgewingsbalans

Opvoeders afdeling

Memorandum

Volgorde:

B;

D;

C;

A

Leerder afdeling

Inhoud

Aktiwiteit: om te verstaan hoe diere en insekte verskil ten opsigte van voortplanting/lewensiklus [lu 2.3]

(i) Diere verskil ook ten opsigte van hul voortplanting

Party kleintjies lyk net soos die volwassene by geboorte, maar ander moet eers ‘n gedaanteverwisseling (verandering of metamorfose) ondergaan voordat hulle soos die volwassene lyk. Sommige diere ondergaan ‘n gedeeltelike gedaanteverwisseling en ander ‘n volledige gedaanteverwisseling. ‘n Volledige gedaanteverwisseling bestaan uit die volgende stadiums: eier word gelê; larwe broei uit; ontwikkel in ‘n papie waaruit die volwassene uiteindelik ontwikkel.

INSEKTE: VRUGTEVLIEË

Vrugtevlieë behoort aan die Drosophilia-familie en is veral bekend as laboratoriumdiere waarmee daar proefnemings gedoen word. In die natuur kan hierdie vlieë soms groot skade in vrugteboorde aanrig as hulle nie betyds bestry word nie.

Volwasse vrugtevliegwyfies lê hul eiers in die skil van die vrugte wat dan vinnig sleg word en afval van die bome af. Die verrottende vrugtevleis is die voedingbron vir die larwe wat uitbroei. Die larwe kruip na ‘n paar dae in die grond en verander in ‘n papie. Na ongeveer twee tot drie weke kom die volwasse vlieg uit die papie te voorskyn.

Om die vrugtevlieg te bestry, moet sowel die volwasse vlieg wat die vrugte in die bome besmet as die grond onder die bome waar die papies is, met plaagmiddels behandel word.

Een wyfie kan 15 tot 50 eiers per dag lê en kan tot 900 eiers in ‘n leeftyd lê. Die hele lewensiklus van ‘n vrugtevlieg neem ongeveer twee weke. Voordat paring plaasvind, moet die manlike vlieg eers die wyfie hofmaak. Die wyfie sal hom slegs aanvaar as hy volwasse is en van dieselfde spesie as sy is. Die wyfie herken ‘n mannetjie van dieselfde spesie deur haar sig, gehoor en reuksin.

Opdrag 9

Die volgende skets stel die lewensiklus van die vrugtevlieg voor, maar in die verkeerde volgorde. Plaas dit in die korrekte volgorde en maak dan jou eie illustrasie van die volledige gedaanteverwisseling van die vrugtevlieg.

Groepassessering

Volgorde korrek 1 2 3 4
Kreatiewe voorstelling ______ ______ ______ ______
Sketse/illustrasies in verhouding ______ ______ ______ ______
Byskrifte ______ ______ ______ ______
Volgorde korrek ______ ______ ______ ______

Assessering

Leeruitkomste 2: Die leerders ken, interpreteer en pas wetenskaplike, tegnologiese en omgewingskennis toe.

Assesseringstandaard 2.3: Dit is duidelik wanneer die leerder inligting interpreteer.

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, Natuurwetenskappe graad 6. OpenStax CNX. Sep 17, 2009 Download for free at http://cnx.org/content/col11080/1.1
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