Hi


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I just purchased the latest 2014 prelim however due to the logo of the vendor, many words in the question papers were being blocked and cannot be read. Please advise.

anneshirleygilbert:

Hello Everyone,


I need some help in crafting a comprehensive answer to this question:
\"What is a control set-up in an experiment? and what is its purpose?\"

I've not read anything from Niedino for a long time. Would really appreciate her input.

Sincerely,
Anne

Control set-up in an experiment has the exact same conditions as the experimental setups except for the tested variable( changed variable).

Purpose:
To ensure that any changes/difference in the (variable changed/result of the experiment) is due only to the (changed variable) and not due to other variables/factors.

E.g.
Aim of experiment: To find out if the presence of wind affects the rate of evaporation.
CV: presence of wind
Variable measured: amount of water left in a container at the end of the experiment

Control set-up:
Container left in a location without exposure to wind

Purpose of control set-up:
To ensure that any changes in the amount of water left in the container at the end of the experiment(or \"any difference in the rate of evaporation\") is only due to the presence of wind and not due to other variables.

Hope this helps.

Regards,
KC

anonymus:

beauty queen:

[quote=\"Polar bear\"]Thanks.

One of my suggestions for the decomposition question was to put the jar in a dark room and my reason was that it would allow more decomposers to come into the jar, thus speeding up decomposition.

Can someone tell me if this is acceptable

No i do not think so. As the rotten log habitat or the leaf litter habitat is dark i am not sure darkness is a factor for the growth of decomposers

just my 2 cents

One of the factors for Rotting log habitat is dampness n darkness. So, i think polar bear ans is correct[/quote]Based on my mini 'research', darkness is not a factor that contributes to speeding up decomposition.

The answer is dependent on how the question is asked, but basically, the rate of decomposition is dependent upon:
* Temperature (the warmer the better);
* The availability of oxygen;
* Access by scavengers;
* Humidity, or wetness;
* Rainfall/Dampness;
etc...