Read this essay to learn about the theories on the origin of angiosperms. Theories on the Origin of Angiosperms Essay Contents: Essay on the Isoetes-Monocotyledon Theory Essay on the Conifer-Amentiferae Theory Essay on the Gnetales-Angiosperm Theory Essay on the Bennettitalean Theory Essay on the Caytonialean Theory Essay on the Pteridosperm Theory Essay on the Pentoxylales Theory Essay # 1. Isoetes-Monocotyledon [...]
In this essay we will discuss about the process of inflorescence in flowers. Essay # 1. Meaning of Inflorescence: Flowers are arranged in various ways in different plants. The arrangement of flowers on the floral axis (shoot system) of a plant is called inflorescence. The character of inflorescence (Fig. 2.79) has profused taxonomic significance. This characteristic is found to be [...]
In this essay we will discuss about the fossil records of different geological strata. Essay # 1. Fossil Records of Pre-Cambrian Era: The Pre-Cambrian includes approximately 90% of the geologic time which covers approximately 4,200 million years (m.y.) of the earth history (Table 1.2). The Pre-Cambrian world was almost certainly as diverse and complex a place as today's world. Most [...]