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. […]
The Time of Origin of Earliest Angiosperms
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Geographic Information System (GIS)
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The below mentioned article provides a short notes on Geographic Information System (GIS). GIS or geographic information system combines layers of information about a place or area to give a better understanding of it. For a full GIS, one requires hardware (computers and peripherals), software, data and sound analysis methods for interpreting the results generated […]
Theories about the Ancestors of Angiosperms
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The following points highlight the top nine theories about ancestors of angiosperms. Some of the theories are: 1. The Isoetes – Monocotyledon Theory 2. The Coniferales-Amentiferae Theory 3. The Gnetaies’-Angiosperm Theory 4. The Anthostrobilus (Bennettitalean) Theory 5. The Caytonialean Theory 6. The Stachyospory-Phyllospermae Theory 7. The Pteridosperm Theory and Others. 1. The Isoetes – Monocotyledon […]
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