“Orders conal” (Conical orders) refers to:

Correct option is B

· Conal orders = Horton’s stream order system
· 1st order → smallest tributaries
· 2nd → joining of two 1st order streams
· Higher orders → stronger drainage
· Used in watershed hydrology.
Why other options are wrong
· (a) Soil structure has no “orders conal.”
· (c) Soil taxonomy uses orders, but not conal orders.
· (d) It is a derived watershed property, not a classification type.