Question

Give reasons: 1) Both strach and cellulose are polysaccharides but iodine gives colour test with strach and not with cellulose

Answer 1

u r right that both starch and cellulose r polysaccharides but there is a structural difference between them due to which iodine gives colour test with starch and not with cellolose.
In case of starch the structure is helical or helix shaped due to which it holds the molecules of iodine in it due to which the colour test is successful in this case but in case of cellulose it doesnt have a helical stuctur to hold the iodine molecules so no reaction takes place....
i hope it helped u...
if u r satisfied then please mark this answer as brainliest answer....
please....

Answer 2

Heya !!!

Here's your answer !!

Polysaccharides are polymeric carbohydrate molecules composed of long chains of Monosaccharide units bound together by Glycosidic bonds....

Cellulose is a homopolymer as it consists of only one type of Monosaccharide called Glucose.It is a structural polysaccharide...

Starch is a homopolymer of glucose and it is used as energy storage in plant tissues...

Starch can hold Iodine molecules in the helical portion .The starch - Iodine is blue in colour...

Cellulose doesn't contain complex helices and hence cannot hold Iodine and do not develop blue colour...


Hope this helps you :)

Please mark as brainliest