ICSE Class X Biology 2018 Solved Papers

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Choose between the two options to answer the question specified in the brackets for the following :
An example is illustrated below.
Example: Corolla or Calyx (Which is the outer whorl?)
Answer : Calyx
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Question : 21
Total: 97
Sclerotic layer or choroid layer (Which one forms the Iris?)
Solution:  
Choroid layer
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