Watermelon has unisexual flowers; the male and female flowers are separate. The presence of pollinators will facilitate cross pollination between the flowers increasing the chance of fertilization and number of fruits being produced. Without pollinators the probability of pollen falling on stigma reduces in a unisexual flower, especially if they are far apart thus the number of fruits produced will be less. (ii) The three changes observed are: ● Ovule develops a tough coat and becomes seed. ● Ovary grows and ripens to form fruit. ● Petals, sepals, stamen, style and stigma may shrivel and fall off.