12th Zoology

Bio Zoology Biology Higher Secondary Second Year Tamil Nadu State Board

Bio Zoology Biology Higher Secondary Second Year Tamil Nadu State Board Syllabus Human Physiology Content Zoology Introduction – Carbohydrates – Proteins – Lipids – Vitamins – Minerals – Water – Balanced diet – Calorie values (ICMR standards) – Obesity – Hyperglycemia – hypoglycemia – Malnutritions. Digestion : Enzymes and enzyme action – Brief account of following – Dental […]

12th Zoology

Modern concept of Natural Selection (or) Modern synthetic theory of Evolution

Modern concept of Natural Selection (or) Modern synthetic theory of Evolution Modern development in biological fields such as Cell biology, Genetics and Populations genetics helped in the development of modern synthetic theory of evolution. It was caused due to contributions made by eminent scientists such as Th. Dobzhansky, S.Wright, H.J.Muller, J.S. Huxley, R.A.Fisher, Ernst Mayr, G.L.Stebbins […]

12th Zoology

Objections to Darwinism

Objections to Darwinism While the ideas of Darwin, related to reproductive capability, prevalence of variations, concept of struggle and survival of suitable forms are all commonly accepted, there are certain drawbacks in his original theory. 1. Darwin could not explain, the origin and cause for variations while insisting their importance in progressive evolution. 2. He […]

12th Zoology

The Theory of Natural Selection

The Theory of Natural Selection During his period of study Darwin has made several observations and collected facts. Through these facts he arrived at certain conclusions. These conclusions constitute Darwinism. Thus Darwinism or the theory of Natural selection includes the following elements. 1. Overproduction or Prodigality of nature All living beings have an innate desire […]

12th Zoology

Darwinism

Darwinism Darwinism comprises the natural selection concept as advanced by Charles Robert Darwin in 1859. His theory provided the correct idea to explain all processes and intricate mechanisms of evolution. The theory of natural selection is considered on par with Newton’s law of gravitation and Einstein’s theory of relativity. The monumental work of Darwin was […]

12th Zoology

Neo lamarckism

Neo lamarckism Lamarck’s ‘theory of inhertitance’ was further studied by a group of scientists. Their ideas supporting Lamarck’s opinion collectively constitute neo Lamarckism. The neo Lamarckians were of the opinion that ‘adaptions’ are universal in nature. An adaptation happens through causal relationship of structure, function and environment. Due to changes in the environment, habits and […]

12th Zoology

Lamarck Laws

Lamarck Evolution Laws Jean Baptiste de Lamarck (1744 – 1829) is well known for his theory of evolution. In 1809 he published his book titled ‘Philosophie Zoologique’. This book contains his views on evolutionary mechanisms. Eventhough the views of Lamarck are not fully accepted, he occupies a very important place in the history of evolutionary […]

12th Zoology

THEORIES OF EVOLUTION

THEORIES OF EVOLUTION Introduction Several opinions had been made available to explain the origin and existence of various forms of life. The existing living beings show characteristic resemblances in form and functions. There are evidences for succession of several types of living organisms occupying earth. Populations of animals and Plants tend to undergo predictable changes […]

12th Zoology

Autoanalyser

Autoanalyser To assist in the diagnaosis of diseases and disorders and to monitor therapy, a wide range of clinical tests has been developed. The demand for investigations is growing with the growing population and diseases. To get fast results on a large number of specimens, it is becoming inevitable to replace manual methods. This could […]

12th Zoology

Endoscopy (Laproscopy) techniques

Endoscopy (Laproscopy) techniques Endoscopy is a method of examining the interior of a body cavity or hollow organ (e.g., oesophagus, stomach) using an endoscope, a narrow, flexible fiber optic instrument that conducts light. Until recently, surgery was the most traditional of medical practices, employing techniques and instruments developed more than a century ago, but now […]

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