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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

What are the factors that affect demand for a commodity
Florence Reply
differentiate between demand and supply giving examples
Lambiv Reply
differentiated between demand and supply using examples
Lambiv
what is labour ?
Lambiv
how will I do?
Venny Reply
how is the graph works?I don't fully understand
Rezat Reply
information
Eliyee
devaluation
Eliyee
t
WARKISA
hi guys good evening to all
Lambiv
multiple choice question
Aster Reply
appreciation
Eliyee
explain perfect market
Lindiwe Reply
In economics, a perfect market refers to a theoretical construct where all participants have perfect information, goods are homogenous, there are no barriers to entry or exit, and prices are determined solely by supply and demand. It's an idealized model used for analysis,
Ezea
What is ceteris paribus?
Shukri Reply
other things being equal
AI-Robot
When MP₁ becomes negative, TP start to decline. Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of lab
Kelo
Extuples Suppose that the short-run production function of certain cut-flower firm is given by: Q=4KL-0.6K2 - 0.112 • Where is quantity of cut flower produced, I is labour input and K is fixed capital input (K-5). Determine the average product of labour (APL) and marginal product of labour (MPL)
Kelo
yes,thank you
Shukri
Can I ask you other question?
Shukri
what is monopoly mean?
Habtamu Reply
What is different between quantity demand and demand?
Shukri Reply
Quantity demanded refers to the specific amount of a good or service that consumers are willing and able to purchase at a give price and within a specific time period. Demand, on the other hand, is a broader concept that encompasses the entire relationship between price and quantity demanded
Ezea
ok
Shukri
how do you save a country economic situation when it's falling apart
Lilia Reply
what is the difference between economic growth and development
Fiker Reply
Economic growth as an increase in the production and consumption of goods and services within an economy.but Economic development as a broader concept that encompasses not only economic growth but also social & human well being.
Shukri
production function means
Jabir
What do you think is more important to focus on when considering inequality ?
Abdisa Reply
any question about economics?
Awais Reply
sir...I just want to ask one question... Define the term contract curve? if you are free please help me to find this answer 🙏
Asui
it is a curve that we get after connecting the pareto optimal combinations of two consumers after their mutually beneficial trade offs
Awais
thank you so much 👍 sir
Asui
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities, where neither p
Cornelius
In economics, the contract curve refers to the set of points in an Edgeworth box diagram where both parties involved in a trade cannot be made better off without making one of them worse off. It represents the Pareto efficient allocations of goods between two individuals or entities,
Cornelius
Suppose a consumer consuming two commodities X and Y has The following utility function u=X0.4 Y0.6. If the price of the X and Y are 2 and 3 respectively and income Constraint is birr 50. A,Calculate quantities of x and y which maximize utility. B,Calculate value of Lagrange multiplier. C,Calculate quantities of X and Y consumed with a given price. D,alculate optimum level of output .
Feyisa Reply
Answer
Feyisa
c
Jabir
the market for lemon has 10 potential consumers, each having an individual demand curve p=101-10Qi, where p is price in dollar's per cup and Qi is the number of cups demanded per week by the i th consumer.Find the market demand curve using algebra. Draw an individual demand curve and the market dema
Gsbwnw Reply
suppose the production function is given by ( L, K)=L¼K¾.assuming capital is fixed find APL and MPL. consider the following short run production function:Q=6L²-0.4L³ a) find the value of L that maximizes output b)find the value of L that maximizes marginal product
Abdureman
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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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