age structure ecology

Ecological Pyramids - Ecological pyramids are also called 'Eltonian pyramids' after C. Elton. Charles Elton (1927) developed the concept of ecological pyramids who noted that "the animals at the base of a food chain are relatively abundant while those at the end are re..

Progressive deterioration in the structures and functions of cells tissues and organs..

Ageing - Ageing can be defined as the progressive deterioration in the structure and function of the cells, tissues, organ and organ systems of the organism with advancing age. The field of developmental biology that deals with the process of ageing..

The relative abundance of the organisms of various age groups in the population is called age distribution of population. With regard to age distribution, there are three kinds of populations. i) Rapidly growing population is a population, which has high birth rate an..

Neils Bohr was a eminent Danish Physicist who obtained his doctorate in theoretical Physics in 1911. He made a great contribution towards the understanding of atomic structure and quantum mechanics. He was awarded the Nobel Prize in Physics at the young age of 37, in 1922, prima..

Introduction - Biogeography reveals that living organisms (plants and animals) are found practically everywhere on this earth. The living components interact among themselves as well as with their physical environment like soil, air and water. The branch of biology, which deals with the relationshi..

Smallest unit of ecological hierarchy is the organism, while smallest and basic unit of taxonomic hierarchy is species. A group of individuals, having similar structural and functional characters, capable of potential interbreeding is termed as species. In nature all apecies exh..

According to this theory, the accumulation of cross linked proteins damages cells and tissues and slows down bodily processes resulting in ageing. In a process called non-enzymatic glycosylation, glucose molecules attach themselves to proteins resulting in a chain of chemical reactions. T..

An ecosystem can be defined as 'a structural and functional unit of biosphere or segment of nature consisting of community of living beings and the physical environment, both interacting and exchanging materials between them'. E. P. Odum, an American ecologist, defined ecology a..

Growth period in man may be divided into 5 stages. Prenatal stage - 9 months of embryonic life Infantile stage - Birth to 10 months of age Early childhood - 10 months to 5 years of age Juvenile stage - 5 years to 14 years or the time of puberty Adolescent and post adolescent stage - 14 ye..