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A level Biology: Post your doubts here!

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Can Anyone help me with this question.I don't get it
upload_2018-6-4_8-50-45.pngupload_2018-6-4_8-50-45.png upload_2018-6-4_8-50-45.png upload_2018-6-4_8-50-45.png upload_2018-6-4_8-50-45.png
 

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I saw a pastpaper in which they asked a social reason because of which it is difficult to control malaria and it was travel but in prev past paper they said tourism and travel is wrong btw it should be because malaria isin't a contagious diseases like TB etc so WHY?????
 
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Lol I said 5 plz read carefully...................
Not 9 or 10 bqz that particular question says phopholipid LAYERS so 5 times 2 is 10
This question asks about phopholipid BILAYERS which is 5 NOT 10....
Oh I get it :)
No u :D
 
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Concentration is always consectively halfed of the previous conc of volume in serial dilutions so A.Serial dilution came in paper 34 As well I guess
20: Answer D
 
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Sorry I don't get you.The concentration is halved each time so answer is A.Simple.
8/2=4%. 4/2=2% 2/2=1% 1/2=0.5% and so on
 
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