Edexcel IAL biology A2 Unit 6 June 2018

what did yall do for the first question? respiro or spiro

For q1 I counted each contraction and relaxation as one breath and I measured the time needed for another breath to be taken in using a stopwatch. I heated one test tube using a water bath at 37 degrees and the other one just left it at 25 degrees (room temperature).I placed them in cotton wool inside the test tubes.

I counted the number of contractions and relaxations as well but many of frds wrote respirometer 😭😭

So is it wrong? I mean since the relaxations and contractions were mentioned, we had to use them. Perhaps both will be correct since alternative experiments are accepted in this kind of questions

Yes it is really confusing that the question mentioned bout the relaxations and contractions. Not sure if it’s like for reference and extra knowledge or u really need to include it in ur answer

For q1 I counted each contraction and relaxation as one breath and I measured the time needed for another breath to be taken in using a stopwatch. I heated one test tube using a water bath at 37 degrees and the other one just left it at 25 degrees (room temperature).I placed them in cotton wool inside the test tubes.

did same as ventilation was mentioned but in my circles people also did respirometre..
tell me about affect of temperature on ventilation rate ?
2) CAN HUMIDITY BE CONTROLLED BY USING AC.