Ovule – Definition & Detailed Explanation – Botanical Terms Glossary

What is an ovule?

An ovule is a structure found in the ovaries of seed plants that contains the female reproductive cells. It is a crucial part of the plant’s reproductive system and plays a vital role in the process of fertilization and seed formation.

How is an ovule formed?

Ovules are formed within the ovary of a flower during the process of ovule development. The ovule begins as a single cell within the ovary, which undergoes several rounds of cell division to form the mature ovule. The ovule is surrounded by protective layers, including the integuments, which help to protect and nourish the developing female gametophyte.

What is the function of an ovule?

The primary function of an ovule is to produce and protect the female reproductive cells of the plant. The ovule contains the egg cell, which is fertilized by the male gametes to form a zygote. This zygote then develops into an embryo, which eventually grows into a new plant. In addition to producing the female gametes, ovules also play a role in seed formation and dispersal.

What are the parts of an ovule?

An ovule consists of several parts, including the nucellus, integuments, micropyle, and embryo sac. The nucellus is the central part of the ovule that contains the female gametophyte. The integuments are protective layers that surround the nucellus and help to nourish the developing embryo. The micropyle is a small opening in the integuments that allows for the entry of pollen during fertilization. The embryo sac is the female gametophyte within the ovule that contains the egg cell.

How does fertilization occur in an ovule?

Fertilization in an ovule occurs when pollen grains land on the stigma of a flower and germinate to form pollen tubes. These pollen tubes grow down through the style of the flower and into the ovary, where they reach the ovules. The male gametes are then released from the pollen tubes and fertilize the egg cell within the ovule. This fertilization process results in the formation of a zygote, which develops into an embryo within the ovule.

What is the significance of ovules in plant reproduction?

Ovules are essential for the reproduction of seed plants, as they are responsible for producing the female gametes that are necessary for fertilization. Ovules play a crucial role in the formation of seeds, which are essential for the survival and dispersal of plant species. Without ovules, plants would not be able to reproduce sexually and produce offspring with genetic diversity. Overall, ovules are a fundamental part of the plant reproductive system and are essential for the continuation of plant species.