Assertion: Specialised plant structures such as rhizomes, tubers, corms, bulbs, etc., are excellent methods of a asexual reproduction.
Reason: : They are common means of propagation in most of monocot families.

Both Assertion (A) and reason (R) are correct and R is the correct explanation of A.

Rhizomes, tubers, corms, and bulbs are the modified structures involved in storage of food in plants. These structures can be used as the source for vegetative propagation in the plants. This method is commonly used as the asexual reproduction method in the flowering plants (monocot and dicots). These structures allow the production of more number of plants from a single plant in less time.