Question

Flowers are unisexual in
a) Onion
b) Pea
c) Cucumber
d) China Rose

Answer 1

Hint: Onion, pea and China rose to have flowers in which the stamen and pistil are found while in cucumber, some flowers have stamens while the others have pistil.

Complete step by step solution: We know that flowers are the sexual reproductive organs of the angiosperms or the flowering plants. Therefore, flowers must have male and female reproductive organs. Makes sense? Well, yes, flowers have the male reproductive organs called the stamens grouped in a whorl called androecium and female reproductive organs called the pistil grouped in a whorl called gynoecium. The other parts of the flower, called petals (grouped in a whorl called corolla) and sepals (grouped in a whorl called calyx) are the accessory organs. That is because they are not directly involved in the fertilization process of sexual reproduction.
Now, these stamens and pistils can either be present in the same flower or in different flowers. When these are present together in the same flower, the flower is said to be bisexual, as both the male and female sex organs are present. This is seen in flowers of onion, pea, China rose, etc.
When the stamens are present in a different flower than pistil, the flowers become unisexual. Those flowers that only have the stamens become the male flowers and are called staminate flowers. While those that have only pistil present in them are called the female flowers or the pistillate flowers.

Therefore, the correct answer is option C.

Note: Those plants in which staminate and pistillate both flowers are present are called monoecious plants, as seen in case of cucumber. Those plants in which only staminate flowers are present on one single plant while pistillate flowers are present on a different plant are called dioecious plants. For example, date palm plants.