Category: History

4 Important Factors That Influence the Rate of Extinction of Species are as follows: 1. Population Size and Geographic Distribution: Smaller populations are at greater risk of extinction than larger ones. Rosenzweig and Clark (1994) examined data from their studies of bird populations of the British Isles (Diamond, 1984). Their study shows that extinction probability decreases as population size increases. Similar finding are on record in case of spider populations on islands (Schoenor and Spiller, 1992) and bighorn sheep (Berger, 1990).Small populations are seriously affected than large ones due to small changes in natality, mortality or environmental factors. Larger genetic variability and distribution pattern of large population serve as a buffer in protecting them from risk of extinction. Geographic distributions and longevity of many species can be estimated (Jablonski and…

The Important Perspectives of Indian Caste System are described below:Caste system in India has been studied from three perspectives i.e. Indological, Socio- Anthropological and Institutionalist. Indologists view caste from the scriptural point of view, Social-Anthropologists from the cultural point of view, and Sociologist from the point of view of stratification. (A) Indological-Religious Perspective: ADVERTISEMENTS: In the Indological-religious perspective, the exponents take their cue from the ancient scriptures and present their views on the origin, purpose, and future of the caste system. They hold the view that Varnas originated from Brahma and castes emerged as fissional units of the varna system.The origin of Castes came due to the need and development of division of labour in the society. Brahmins were given the superior position in society because of their knowledge of…

The terrestrial habitat lacks both water and salts in the surrounding medium (air), therefore, the terrestrial animals often face the problem of both water and salt losses. Image Source: images.slideplayer.com ADVERTISEMENTS: Water loss may be due to evaporation of water from the general body surface or through sweat or through urine.Salt loss may be due to sweat and urine. This problem can only be solved by remaining in water and salt balance that is by maintaining a balance between water and salt loss and water and salt gain.Therefore, the terrestrial animals usually drink large amount of water and develop various devices for the conserva­tion of tissue water and feed on such food materials which are rich in salts so that the deficiency of salts may be compensated.In terrestrial animals such…