The upcoming discussion will update you about the difference between monocot and dicots. a. Number of Cotyledons: The actual basis for distinguishing the two classes of angiosperms is the number of cotyledons found in the embryo, and is the source of the names Monocotyledonae (one cotyledon) and Dicotyledonae (two cotyledons). b. Venation: In monocots, there are usually a number of [...]
The following points highlight the seven hypotheses of origin of monocots. 1. According to Engler and his associates, Isoetales, Ophioglossales and a few other pteridophytes are ancestors to monocots. The herbaceous monocots have been considered to be more primitive than woody dicotyledons by them. However, this view is contradicted by the fact that, the woody habit is now generally accepted [...]
This article provides a summary on Views Regarding the Time of Origin of Earliest Angiosperm. We have to depend almost entirely upon fossil evidence for the determination of the first traces of angiosperms. Unfortunately, due to lack of proper fossil records, palaeobotanical studies have not been able to solve the mystery about the earliest angiosperms. There are several views regarding [...]