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In the last unit we traced the human evolutionary history mostly from a palaeontological viewpoint. Although still fragmentary, the available fossil evidence makes it possible to construct a more or less coherent story of human origin and its development. Besides suggesting a primate ancestory, fossil evidence has indicated various trends in human evolution. Today the modern man is regarded as a climax of the evolutionary process. But several questions are raised as to which direction the human evolution is proceeding now and what direction will it take in the future. Is the be-all and end-all of all the evolutionary process? Or do human beings continue to evolve biologically? It may not be possible to provide a direct answer to these questions since evolution is a long term process and the effects could be visualised only after tens of thousands of years.
What are the major terrestrial biomes? The main terrestrial biomes are: tundra, taigas (or boreal forest), tropical forests, temperate forests, grasslands and deserts.
What are living and nonliving reservoirs? Viruses are both living as well as non-living. They have reservoirs of genes. A one nucleotide is a unit of gene. Viral genes make use
Q. Why are transgenics considered a threat to the environmental safety? The Transgenics can be dangerous to the whole biosphere since the transfer of genes between species may
what year did virchow state where a cell exists there must have been a pre-existing cell
Embryo - Pollen Biology The suspensor cells of young embryos of Tropaeolum majus show that the activity of acid phosphatase increases from micropylar to chalazal pole. The con
OTHE R GLANDS - (i) Mammary glands - Study of mammary gland is mastology. Modified sweat gland. 4-5 pairs in rabbit. 1 pair in human. In opposum 25 pairs (max.).
Q. which of structures is the nuclear membrane composed? Eukaryotic cells have nucleus delimited with two juxtaposed membranes that continue with the membrane of the endoplasmi
Secondary and Tertiary Consumers - Biotic Components Besides there are animals which depend on herbivores for food and are called secondary consumers. Since secondary consumer
Q What are the three major types of nitrogen wastes excreted by living beings? The main nitrogen wastes excreted by living beings are ammonia, urea and uric acid. Living beings
High blood pressure makes your heart work harder and, over time, can damage blood vessels throughout your body. If the blood vessels in your kidneys are damaged, they may stop remo
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