Question

Integumented megasporangia first evolved in which plant group?

Answer 1

First complete seeds appeared approximately 365 million years ago during late Devonian times. Technically a seed may be defined as a fertilized ovule. An ovule is an integument indehiscent megasporangium. Integuments are specialized protective coverings around megasporangium which vary in number. All seed producing plants are called spermatophytes.

Answer 2

The integumented megasporangia fist evolved in flowering plant group because in seed plants, the ovule is the structure that gives rise to and contains the female reproductive cells. It consists of three parts: The integument, forming its outer layer, the nucellus or remnant of megasporangium, and the female gametophyte in its center.

First total seeds showed up around 365 million years prior amid late Devonian times. In fact a seed might be characterized as a prepared ovule. An ovule is an integument indehiscent megasporangium. Integuments are specific defensive covers around megasporangium which change in number. All seed creating plants are called spermatophytes.