no extinct close features. e.g. Ginko biloba . .
. Determination of age of Fossils The age of fossils is determined by radioactive elements present in it. They may be carbon, uranium, lead or potassium. It is used in paleobotany and anthropology for determining the age of human fossils and manuscripts.
Radioactive carbon(C ) dating method This method was discovered by W.F. Libby ( ). Carbon consumption of animals and plants stops after death and since then, only the decaying process of C occurs continuously. The time passed since death of a plant or animal can be calculated by measuring the amount of C .
present in their body. More to Know What is the Geologic Time Scale? The geological time scale is a system of chronological dating that relates geological rock strata to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth’s history. Origin and Evolution of Life Thiruvakkarai fossil wood park (Villupuram district, Tamil Nadu): million years ago tree trunks that got buried along the river, incourse of time the organic matter was replaced by silica and was fossilized.
They retained their color, shape and texture and was converted into solid rocks. The annular rings, the texture, colors of the layers, nodes and every properties of plants are still visible. . Ethnobotany Ethnobotany is the study of a region’s plants and their practical uses through the traditional knowledge of the local culture of people.
The term Ethnobotany was coined by J.W. Harshberger in to include the study of plants used by the primitive and aboriginal people. Though this discipline has existed for ages, ethnobotany emerged as a distinct academic branch of natural science in th century. Aspects of ethnobotany Ethnobotany has relevance with problems of nutrition, health care and life support system, faith in plants, cottage industries, economic upliftment, conservation of biodiversity and sustainable use of plant resources.
Importance of Ethnobotany It provides traditional uses of plant. It gives information