In this article we will discuss about Polyembryony in Various Groups of Gymnosperms. After reading this article you will learn about: 1. Meaning of Polyembryony 2. Types of Polyembryony 3. Polyembryony in Various Groups of Gymnosperms. Meaning of Polyembryony: The phenomenon of the development of more than one embryo in one ovule, seed or fertilized ovum is called polyembryony. It [...]
Learn about the comparison of Embryogeny and Seed of Cycas and Embryogeny and Seed of Pinus. Comparison # Embryogeny and Seed of Cycas: 1. The wall formation of cycas in the oospore starts only when numerous nuclei have been formed. 2. Pro-embryo in cycas, has no clear tiers in the young stage. 3 Only one potential embryo develops in cycas, [...]
In this article we will discuss about the Origin of Secondary Wood, Primary Vasculature and Leaf in Gymnosperms. Origin of Secondary Wood in Gymnosperms: Under-mentioned are some of the studies which indicate that the secondary wood of the modern gymnosperms might have originated in the Progymnospermopsida of Upper Devonian period: (1) The frond-genus Archaeopteris of Progymnospermopsida had very large fern-like [...]