ICSE Class X Biology 2015 Solved Papers

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The diagrams given below are cross sections of blood vessels :
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Question : 64 of 98
 
Marks: +1, -0
Name the parts labelled 1 to 3.
Solution:
1. Connective tissue layer/Tunia externa,
2. Lumen,
3. Muscular layer / Tunia interna.
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