Question

Name the largest and smallest flower?

Answer 1

Also called as a bloom or blossom, the reproductive structures that are found in flowering plants are the flowers. Facilitating reproduction is the main biological function of a flower. The flowers may facilitate outcrossing, which results from cross pollination or allow selfing when self-pollination occurs. Flowers contain specialized structures called sporangia, which are the site where gametophytes develop.

Complete answer:
The characteristic reproductive structures of angiosperms are known as flowers.
The largest flower that has ever been discovered is Rafflesia arnoldii , which is a species of flowering plant in the parasitic genus Rafflesia. This flower has a strong and unpleasant odor of decaying flesh and is native to the rainforests of Sumatra and Borneo. One of the three national flowers in Indonesia is the Rafflesia arnoldii. White jasmine and moon orchid are the other two national flowers. In Sumatra, it is called as kerubut. Rafflesia is a vascular plant but it lacks any observable leaves, stems or even roots. They even do not have chlorophyll. The Rafflesia is a holoparasite that lives on Tetrastigma vines.
The genus Wolffia includes the smallest flowering plants on Earth and has about $9 - 11$ species. Commonly known as watermeal or duckweed, these aquatic plants have a resemblance to specks of cornmeal floating on the water. These species are generally free-floating thalli, green or yellow-green, and do not have roots. At the top surface of the plant body, the flowers are produced in a depression. These flowers have a single stamen and single pistil.

Therefore, The Largest flower:Rafflesia arnoldii , smallest flower: Watermeal (Wolffia).

Note:
The flower of Rafflesia arnoldii grows up to a diameter of around $1$ meter. This flower weighs up to $11$ kilograms. Rafflesia arnoldii emerges from very large, cabbage-like, maroon or dark brown buds which are typically about $30{\text{ }}cm$ wide. On a dry matter basis, the Wolffia species are composed of about $40\%$ protein. This is about the same as soybean which makes them a potential high protein source for human food.