What Are Ovules And Where Can They Be Found?

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An orthotropous ovule is one in which micropyle and class 12 biology CBSE from www.vedantu.com

Ovules are the female reproductive organs in some plants. They are found inside structures known as ovaries, which are found in plants with flowers. Ovules contain an embryo sac, which contains the egg cells and the female gametes. The male gametes are produced in the pollen grains, which are carried to the ovules by insects, wind, or other means. Ovules are essential for sexual reproduction in plants, as they develop into seeds once fertilized.

The Different Types of Ovules

Ovules come in various shapes and sizes, depending on the species of plant. Most ovules have a single ovary and one or two integuments that protect the embryo sac. They can be found in a variety of colors, including yellow, green, and brown. The shape of the ovule can also vary, from round to elongated to oval.

How Ovules Develop

Ovules typically go through three stages of development. During the first stage, the ovule develops its integuments, the protective layers that keep it safe. During the second stage, the ovule develops its embryo sac, which contains the egg cells and the female gametes. Finally, during the third stage, the ovule develops its endosperm, which is the nourishment the seed needs to develop.

How Pollination Occurs

Pollination occurs when the pollen from the anthers of a flower is transferred to the stigma of another flower. Pollen contains the male gametes, which must then travel to the ovules in order for fertilization to occur. Pollination can be done by a variety of means, including wind, water, and insects. Insects are by far the most efficient pollinators, as they carry the pollen on their bodies and help ensure that it reaches the ovules.

What Happens After Pollination?

After pollination, the male gametes travel down the pollen tube and reach the ovule. The male gametes then enter the embryo sac and fertilize the egg cells, forming a zygote. The zygote then develops into an embryo, and the ovule develops into a seed. The seed then matures and is released from the ovary, allowing the plant to reproduce.

The Importance of Ovules

Ovules are essential for sexual reproduction in plants, as they are the site of fertilization and development of the embryo. Without ovules, plants would not be able to reproduce and would eventually become extinct. Ovules are also important for the production of food, as they are the source of the seeds which form the edible parts of many plants.

Conclusion

Ovules are the female reproductive organs in some plants, and they are found inside structures known as ovaries. They come in various shapes and sizes, and they contain an embryo sac which contains the egg cells and the female gametes. Pollination is necessary for fertilization to occur, and the ovules develop into seeds after fertilization. Ovules are essential for sexual reproduction in plants and the production of food, and they are a vital part of the life cycle of plants.

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