Question

Which is the bottom and swollen part of the carpel?

Answer 1

In flowering plants, or angiosperms, the carpel is the female reproductive organ that encloses the ovules. The origin of the carpel and its subsequent morphological changes were most likely critical to the evolution of angiosperms, and the carpel is also very important as a precursor organ to the fruit.

Complete answer:
The ovary, which contains the ovules, the style, through which the pollen tubes grow, and the stigma, on which the pollen grains germinate, are the three main parts of the carpel.
Ovary: The female gamete is contained in the swollen bottom part of the flower, which is known as the ovary. In botany, an ovary is an enlarged basal portion of the pistil, a flower's female organ. Ovules are found in the ovary and develop into seeds after fertilization. The ovary will mature into a fruit, either dry or fleshy, that will contain the seeds.
Ovules: When a plant is fertilized, the ovule develops into a seed. A small opening in the integuments (the micropyle) allows the pollen tube to enter and discharge its sperm nuclei into the embryo sac, a large oval cell where fertilization and development take place.
Style: The stigma is a sticky knob located at the top of the pistil. It is attached to the style, which is a long, tube-like structure. The style leads to the ovary, which contains female egg cells known as ovules. The male parts are known as stamens, and they typically surround the pistil.

Thus, the bottom and swollen part of the carpel is called the ovary.

Note: A pistil can be one carpel with an ovary, style, and stigma, or several carpels joined together with a single ovary, with the entire unit called a pistil. The gynoecium can be made up of one or more unicarpellate (one carpel) pistils or one multi-carpellate pistil. tricarpellate is a term used to describe the number of carpels (three carpels).