Pre Fertilisation Structures And Events

Megasporangium is equivalent to the ovule. It is a structure that produces megaspores which further gives rise to the female gametophyte in plants. A megasporangium consists of a nucellus and an integument. Nucellus is the inner part of the megasporangium or ovule.

Megasporangium is connected to the placenta by a stalk called funicle. The outer layer that covers a megasporangium or ovule is called integument. Integument surrounds the nucellus. The point at the tip where integument is absent, is called micropyle. Opposite to the micropyle is the chalaza end that forms the basal part of the ovule. Embryo sac lies inside the nucellus. A functional megaspore develops into a female gametophyte.

The correct answer is:

Option 3: Apomixis

Explanation:

Apomixis is a form of asexual reproduction in plants where seeds are formed without fertilization. This process allows for the production of offspring that are genetically identical to the parent plant. In apomixis, the seeds are formed without the fusion of male and female gametes, meaning fertilization does not occur.

Apomixis can happen in different ways:

In some plants, the embryo is produced from the diploid cells of the ovule, bypassing meiosis and fertilization.

In other plants, the embryo develops from a somatic cell in the ovule or the flower's pistil.

This process is found in several plant species, including certain grasses, dandelions, and other flowering plants.

Why the Other Options Are Incorrect:

Option 1: Budding – Budding is a form of asexual reproduction where a new organism grows from a bud or outgrowth of the parent organism. It is commonly seen in animals like hydra or some fungi, but not in plants that form seeds.

Option 2: Somatic hybridization – Somatic hybridization is a process used in plant breeding where two different plant cells (often somatic cells) are fused to create a hybrid plant. It typically involves fertilization and not the formation of seeds without fertilization.

Option 4: Sporulation – Sporulation is the process of producing spores, which are typically haploid cells that can develop into a new organism under favorable conditions. It is not related to seed formation and does not involve fertilization.

Thus, apomixis is the correct process where seed formation occurs without fertilization.