Which of the following is an accessory organ of flower?

Options

A. Calyx
B. Stamen
C. Gynoecium
D. Carpel

Answer

To determine which of the following is an accessory organ of a flower, we will analyze each option provided in the question.

1. **Calyx**: The calyx is the outermost whorl of the flower, made up of sepals. It protects the flower in its bud stage and can also attract pollinators. However, it is not directly involved in the reproduction process itself.

2. **Stamen**: The stamen is the male reproductive part of the flower, consisting of the anther and filament. It is responsible for producing pollen, which contains male gametes. Therefore, it is a necessary part of the flower.

3. **Gynosium**: The gynosium is the female reproductive part of the flower, consisting of one or more carpels. It is involved in the production of ovules and is essential for fertilization. Thus, it is also a necessary part of the flower.

4. **Carpal**: This term seems to be a misspelling or variation of "carpel," which is the individual unit of the gynosium. Like the gynosium, it is involved in reproduction and is a necessary part of the flower.

Based on the definitions and roles of these parts, the only option that qualifies as an accessory organ is the **Calyx**. Accessory organs are those that do not directly participate in the reproductive process but serve supportive roles, such as attracting pollinators.

**Final Answer**: The accessory organ of the flower is **Calyx**.