Plant Adaptations to avoid self-pollination and encourage cross-pollination

Question 1

In plants with unisexual flowers, …

Answer 1

By having male and female flowers found on different plants (dioecious plants)

Question 2

In plants with bisexual flowers, …

Answer 2

a. by having male reproductive parts (stamens) and female reproductive parts (carpels) of the same flower mature at different times
b. by having anthers located in a position far away from the stigma of the same flower
c. by having incompatible pollen with the stigma of the same flower