The flower is the primary reproductive part of a plant. It contains the organs necessary for sexual reproduction, including the stamens (male organs) and pistils (female organs).

Primary Reproductive Part of a Plant
The correct answer to the question is option 'D', the flower. Here’s a detailed explanation of why the flower is considered the primary reproductive part of a plant:
Function of Flowers
- Flowers are the reproductive structures of angiosperms (flowering plants).
- They facilitate reproduction by producing gametes (male and female reproductive cells).
Parts of a Flower
- Stamens: These are the male reproductive parts that produce pollen (the male gamete).
- Pistil: This is the female reproductive part that contains the ovary, which houses the ovules (the female gamete).
Pollination Process
- During pollination, pollen from the stamen is transferred to the pistil, leading to fertilization.
- Once fertilization occurs, seeds develop in the ovary, allowing for the next generation of plants.
Importance of Flowers
- Flowers attract pollinators (like bees and butterflies) through their color, scent, and nectar.
- This interaction enhances genetic diversity, which is crucial for plant evolution and survival.
Conclusion
In summary, the flower is vital for plant reproduction, making it the primary reproductive part. Other parts of the plant, such as leaves, stems, and roots, serve essential roles in growth, support, and nutrient absorption, but they do not directly participate in the reproductive process.