The ovule of an angiosperm is technically equivalent to -
- megasporangium
- megasporophyll
- megaspore mother cell
- megaspore
The Correct Option is A
Solution and Explanation
In angiosperms (flowering plants), the ovule is a structure that will eventually develop into a seed after fertilization. It is equivalent to the megasporangium, which is the part of the plant where the megaspores are produced. The megasporangium contains the megaspore mother cell, which undergoes meiosis to produce megaspores.
- Megasporangium: This is the tissue that surrounds and protects the developing female gametes (megaspores). It is the ovule in angiosperms.
- Megasporophyll: This is a leaf-like structure that bears the megasporangium, typically found in some plants, but not equivalent to the ovule itself in angiosperms.
- Megaspore mother cell: This is the cell that divides meiotically to form the megaspores within the megasporangium.
- Megaspore: These are the spores formed inside the megasporangium that will eventually develop into the female gametophyte.
Thus, the ovule in angiosperms is technically equivalent to the megasporangium, which houses the megaspore mother cell and undergoes processes leading to the formation of seeds.
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Concepts Used:
Events of Sexual Reproduction
Sexual reproduction entails a complex life cycle. It comprises a set of events that are divided into the following three stages:
- Pre-fertilization: This stage covers the events before fertilization. The two events that take place during this stage are given below.
- Gametogenesis of gamete formation: In eukaryotes, diploid mother cells splits to produce haploid cells known as gametes, in a process called meiosis. This process involves the reunification of genetic materials.
- Transfer of gametes: Since the female gametes are immovable, male gametes are shifted for fertilization. In plants, this is attained by pollination. Unisexual animals transmit gametes through sexual intercourse.
- Fertilization: Two haploid gametes merge or integrate into one diploid cell to produce a zygote, which is the precursor to an embryo offspring, in the process called fertilization. This zygote consolidates the genetic material from both the gametes. It is also known as syngamy.
- Post-fertilization: Fertilization consequences in multiple cell divisions mitotically, without any alternates in the number of chromosomes, and forms a multicellular diploid phase that guides the zygote to develop into an embryo., the process is called embryogenesis.