Ma'am as in the class we have studied the venation of leaves so in cactus as you know that the leaves are modified into spines or thorns so for example i am explaing a child that the leaves having parallel venation will have fibrous roots and the leaves having reticulate venation will have tap root but in cactus if we want to say a small child that what is its root type of by looking at the venation of the leaves so how we will find it?

Dear student,  
​Please find below the solution to the asked query                                

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In majority of cacti, leaves are not found. Green stems called phylloclades take over the function of photosynthesis. Cactus is a dicot, so, leaves if present have reticulate venation.  
Cacti can have taproot system or succulent roots (for storage of food and water).


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Sorry bit difficult.
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