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Class 10
Solutions to CBSE Sample Paper - Science Class 10

Which of the following statements shows the correct results of Iodine Test performed on the leaf from plant X and Y respectively? 

(A) Blue - black colour would be obtained on the leaf of plant Xand no change in colour on leaf of plant Y. 

(B) Blue - black colour would be obtained on the leaf of plant Y and no change in colour onleaf of plant X. 

(C) Red colour would be obtained on the leaf of plant X and brown colour on the leaf of plant Y. 

(D) Red colour would be obtained on the leaf of plant Y and brown colour on the leaf of plant X. 

 

Answer - 

An Iodine test is used to detect presence of starch in the leaf

  • If putting Iodine solution turns the leaf into blue-black , it means starch is present
  • If there is no blue-black color, no starch is present

 

From our experiment

Q 52 - Case - potted plants were kept in the dark - Teachoo.jpg

 

  • In Plant X does not have Carbon Dioxide, so starch will not be present. Thus, it will not turn blue black
  • In Plant Y, since there is Carbon Dioxide, so starch is present. Thus, it will turn blue black

Carbon dioxide is necessary for photosynthesis-01.jpg

So, the correct answer is (b)  

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