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Which of the following is a complete flower?
A) Hibiscus
B) Papaya
C) Bitter Gourd
D) Cucumber

Answer
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Hint: Stamens and pistils of both flowers are not found together. The flower is said to be complete or bisexual when both are present, despite of the absence of some other aspect that makes it incomplete.

Complete Answer:
A flower that has petals, sepals, pistils and stamens is complete; it is said to be incomplete without one or more certain structures.
Now, let us find the solution from the options-
- Both male and female reproductive sections are used in the full bloom. It consists of all four parts, namely stamen, sepals, pistils, and petals. It is sometimes known to be a bisexual plant. Hibiscus, tomato, lily, mango are used in the examples.
- Papaya is absolutely incomplete. Although female flowers lack androecium whorl, male flowers lack gynoecium whorl. In addition, papaya is a dioecious plant that occurs in two different plants, i.e. females and males flowers. Thus, option B is not the correct option.
- A unisexual flower or incomplete flower is a bitter gourd flower which has either male or female reproductive sections. Thus, option C is not the correct option.
- Either stamen or pistils are absent in cucumber flowers. It is sometimes considered a flower that is unisexual. Thus, option D is not the correct option.

Thus, the correct answer is option (A) Hibiscus.

Note: A flower without stamens is pistillate, and female, although it is said that one without pistils is staminate, or male. It is known to be monoecious where the same plant carries unisexual flowers on both sexes; where the females and males flowers are on separate plants, the plant is dioecious; the plant is considered polygamous where there are female, male, and bisexual flowers within the same plant.
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