OVULE Meaning and
Definition
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An ovule is a fundamental reproductive structure found in seed plants, such as gymnosperms and angiosperms. It is an enclosed structure that serves as the site for the development of a female gametophyte and eventually, the formation of a seed upon fertilization. Ovules are generally positioned within the reproductive organs of the plant, such as the ovaries.
Each ovule contains multiple components essential for sexual reproduction. The megasporocyte, a specialized cell, resides within the ovule and undergoes meiosis to produce haploid cells called megaspores. Out of the four megaspores formed, three degenerate, while one remains functional. This functional megaspore undergoes mitotic divisions leading to the development of the female gametophyte or embryo sac.
Within the embryo sac, one or more female gametes are developed. These gametes are known as egg cells, which have the potential to fuse with male sperm cells during fertilization. Additionally, the ovule consists of a protective integument, which surrounds and encloses the female gametophyte, providing security during the reproductive process.
Upon successful fertilization, where pollen tube delivers sperm cells to the ovule, the ovule transforms into a seed. The ovule undergoes changes in its structure, forming a seed coat that encases the embryo. The seed coat protects the embryo from physical damage and harsh environmental conditions, ensuring proper seed germination and fostering the continuation of the plant's life cycle.
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1. The ovum of a mammal, especially while still in the Graafian follicle. 2. A small bead-like structure bearing a fancied resemblance to an ovule; see Naboth's glands. 3. In botany, an embryonic seed.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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In bot., the body borne by the placenta of a plant which gradually changes into a seed; the seed contained in the ovary.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
Common Misspellings for OVULE
Etymology of OVULE
The word "ovule" comes from the Latin word "ovulum", which means "small egg". The Latin term is a diminutive form of "ovum", which means "egg". The term "ovule" was coined in the 18th century to refer to the small structure in plants that develops into a seed after fertilization. It was named so because of its resemblance to an egg.
Similar spelling words for OVULE
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