18. A certain fruit tree is found to have desirable characteristics. These characteristics could be
propagated most easily and quickly by
a planting seeds produced by the tree
b. grafting cuttings taken from the tree
C. cross-pollinating with another tree
d. culturing highly differentiated cells of the tree

Option b. grafting cuttings taken from the tree.

Explanation:

If a fruit tree have some desirable characteristics. These characteristics could be propagated most easily and quickly by grafting cuttings that is taken from the tree.

In grafting method, part of branch is taken from the tree and buried in the soil. This method saves the time which is wasted by planting seeds in the soil.

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i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!