The following points highlight the seven main steps involved in reproduction process of Cycas. The steps are: 1. Male Gametophyte Development 2. Pollination 3. Male Gametophyte Development 4. Mature Sperm 5. Female Gametophyte Development 6. Development of Archegonium 7. Fertilisation. Reproduction Process of Cycas: Step # 1. Male Gametophyte Development (Before Pollination): Microspore is the first cell of the male [...]
In this article we will discuss about Ginkgoales. After reading this article you will learn about: 1. Meaning of Ginkgoales 2. General Characteristics of Ginkgoales 3. Classification 4. Phylogency. Meaning of Ginkgoales: The order Ginkgoales is today represented by only one living member, i.e. Ginkgo biloba. Ginkgoales was, however, very abundantly represented in the world by several species of about [...]
In this article we will discuss about Cordaitales. After reading this article you will learn about: 1. Distribution of Cordaitales 2. Distinguishing Features of Cordaitales 3. Classification 4. Affinities. Distribution of Cordaitales: Cordaitales, an extinct group of Palaeozoic tall trees of gymnosperms, formed "the world's first great forests". The name was given to honour an Australian botanist, A.J. Corda. Majority [...]