A flower that contains both the male and female reproductive structure (stamen and pistil) is called a bisexual flower. Examples of plants bearing bisexual flowers are: 

$\Rightarrow$Water lily ( Nymphaea odorata) 
$\Rightarrow$Rose (Rosa multiflora ) 
$\Rightarrow$Hibiscus (Hibiscus Rosa-Sinensis ) 
$\Rightarrow$Mustard ( Brassica nigra) 
$\Rightarrow$Petunia (Petunia hybrida)

Cucurbit plant bears unisexual flowers as these flowers have either the stamen or the pistil. The staminate flowers bear bright, yellow-colored petals along with stamens that represent the male reproductive structure. On the other hand, the pistillate flowers bear only the pistil that represents the female reproductive structure. Other examples of plants that bear unisexual flowers are corn, papaya, cucumber, etc.