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Choose the best answer:

1. Bicollateral vascular bundle are
 
2. Four exarch radial vascular bundles and little pith are present in
 
3. A typical dicot root is characterised by

a. Number of vascular bundles is four
b. Due to the presence of cambium, it is opened
c. Conjunctive tissue present in between the vascular bundles
d. Pith is present only in older roots