What is an Indehiscent megasporangium?
An indehiscent integument megasporangium in the form of ovule is found in spermatophytes. The ovule then forms the seed after fertilization. So, the correct option is A.
What is Megasporangia and megasporangium?
Megasporangium is the sporangium that produces megaspores and gives rise to the female gametophyte. Ovule is also called megasporangium.
What is Prevule?
A pre-ovule may be defined as an ovule-like structure consisting of a megasporangium which is either naked or invested by unfused or partially fused integumentary lobes and thus lacks a well- defined micropyle.
Which plant group has intergovernmental megasporangium?
Integumented indehiscent megasporangium is also called in angiosperms.
What does Indehiscence mean?
Definition of indehiscent : remaining closed at maturity indehiscent fruits.
What is the megasporangium in angiosperms?
Hence, Nucellus is the megasporangium in an Angiosperm ovule. Nucellus (plural nucelli), is the inner part of the ovule. Cells of nucellus are diploid.
What is MMC botany?
MMC or megaspore mother cell undergoes meiosis in order to maintain the ploidy of the gamete. The MMC is diploid with the help of meiotic division produces haploid megaspores. A megaspore mother cell, also known as a megasporocyte, is a diploid plant cell that goes through meiosis and produces four haploid megaspores.
What is megasporangium in biology?
Note: Megasporangium is a sporangium which produces only megaspores. Ovule is the structure in a plant that develops into a seed after fertilization; the megasporangium of a seed plant with its enclosing integuments. Many found in gymnosperms and gymnosperms.
Do gymnosperms have Integumented megasporangium?
Ovule is the integumented megasporangium in Gymnosperms.
What is the megasporangium in gymnosperms?
gymnosperms. Within each megasporangium, a single cell undergoes meiotic division to produce four haploid megaspores, three of which typically degenerate. The remaining megaspore undergoes mitosis to form the female gametophyte. As the number of free nuclei multiplies, the megasporangium and megaspore wall expand.
How does the megasporangium become indehiscent?
The megasporangium tightly locked by integuments becomes totally indehiscent. This important change led to the evolution and formation of the ovule, which is nothing but an integumented indehiscent megasporangium. In this way more protection is accorded to the egg-containing apparatus in terrestrial environment.
What is the term for an integumented megasporangium?
What is the term for an integumented megasporangium. What is the term for an integumented megasporangium. Integumented indehiscent megasporangium is also called in angiosperms. Integumented indehiscent megasporangium is also called in angiosperms.
Why is the megasporangium important to the development of land plants?
There is further elaboration of the megasporangium so as to enable it to be an ideal starting point for the development of a new plant. Thus seeds provide parental care to the land plants, where megagametophyte is retained within the indehiscent megasporangium and is well-protected by the integument.
What happens to the megasporangium after fertilization?
The megasporangium (ovule) after fertilization is transformed into a seed, the integuments becoming the seed coats. The seed offers maximum degree of protection to a developing embryo under the unfavorable terrestrial environment.