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Need help please in bio practical paper may/june 2007

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hello every one , i have a doubt in the p3 bio M/J 2007 , I was wondering how is the table supposed to look like? and should my method involve simply seeing the intensity of iodine solution in each test tube? I was also wondering when they say serial dilution they mean when the concentration of lead nitrate is 1 then 0.1 then 0.001 and so on ? what would have changed if I made simple dilution like with concentarions of 0.8 , 0.6 or 0.5 ,0.25 ? Can any one help me out please ?
 
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