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Classification:
There were many similarities between things or phenomena which led to their classification. The first classifications were in terms of beings (the living), things (articles and substances, or non-living) and passions or actions. Here arose a kind of descriptive reasoning; if one of a class behaved in a particular way, it was likely that the other in the same class also behaved in the same way. Thus, the accumulation of knowledge and sifting of experiences had major impact on primitive biology and chemistry. Match the three general elements or features of science listed in column I with their associated techniques or practices in column 2 of the table given below. We have done one part of the exercise 'as an example.
So far, we have seen that the primitive society had developed a host of techniques for their material comfort. Archaeological records show that towards the end of the Stone Age, primitive human beings were using many facilities such as huts. sewn garments, bags and buckets. They had also evolved technical devices like canoes. hooks and harpoons, spears, slings, throwing sticks, boomerang etc(Fig.). Many of these are actively being used among some present-day tribes such as the Eskimos, African Bushmen, Australian aborigines and some Indian tribes.
Qualitative Changes The qualitative changes in the structure of proteins in response to stress can lead to the following: Resistance against denaturation of prote
What are the Materials required for Radiographic 1. Alginate impression material. 2. Silicone separating spray/ petroleum jelly 3. Autopolymerizing PMMA (Clear)
Primitive Nervous System - Nerve Net A nervous system creates its appearance for the first time in the phylogeny among Cnidaria. In this group the nerve cells make an irregula
Moss Stage - Xerarch The accumulation of soil, particularly in the crevices and depressions of rock favours the growth of certain xerophytic mosses, e.g., species of Polytrich
On a separate piece of paper, draw a simple family tree for a couple showing children (F1), and lineages from two children showing grand children (G2), great grandchildren (G3), gr
what is the economic importance of obelia
What is the type of reproduction that occurs in roundworms? What typical element do nematode sperm cells have? Nematodes reproduce sexually. The nematode sperm cell does not h
We mentioned earlier that pre-mating mechanisms are concerned with the prevention of occurrence of interspecific crosses. In such cases, a) the potential mates do not meet in wh
Applications : The first operation conducted was ligation of a patent ductus arteriosus through a left thoracotomy. Same approach is used for repair of coarctation of the aorta,
Q. How chloroplasts multiply? Like mitochondria chloroplasts have their own the DNA, ribosomes and RNA and they self-replicate through binary division.
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