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Organisms are made to compete for their needs from the environment. The competition as we pointed earlier could be for the food and territory, to overcome the adverse climatic conditions, to escape from predators or tp combat an infectious diskase. This is indeed the "struggle" It is this "struggb" that keeps the population numbers under manageable levels and from increasing on a logrithmic scale. We earlier referred to the reproductive potential of frogs. If the potential is fully realised, then in a short time, they would be placing a severe strain on the resources on which they depend and soon all of them would starve. However, this is not the case. Most of the population sizes do not increase enormously but they only fluctuate to asmall extent from time to time. Some other populations'however, do increase aramatically in certain seasons and decrease even more dramatically in certain other seasons. In laboratory one can grow cell cultures in which any one of the resources such as food, space etc. is limited. Under these circumstan~es the population growth rate of the cells which is exponential to begin with decreases and levels off: The resulting sigmoidcurve is characteristic of biological growth in general. (Fig. 11.1) The factors that we n. mentioned earlier are the ones which delimit the numbers or size to the carrying capacity of the environment in natural populations. For instance, the 'carrying capacity of the environment for plants is controlled by the ambunt of spact! required 'by the individuals of their own and other species. No new seeds or shoots can develop in that particular area until the older plants fall. Population sizes in animals, as mdntioned earlier can be limited by food supply. Here the number of individuals ,increases until the food shortage occurs. Such a shortage of resources would decrease,the reproduction.
What is a pigment? Scientifically, a chemical that can impart colour and is insoluble in the solvent in which it is used, is referred to as a 'pigment'. Well, you would agree
Features of the Gastrulation The significant features of the gastrulation are: a) Proteins of many new types that were not present in the egg or blastula begin to be synthe
Nutrient Availability You have seen that cation exchange plays an important part in nutrient availability to plants. Cation exchange functions in two ways as nutrients are rele
Rule of Distal Transformation of Blastema An intriguing phenomenon characteristic of limb regeneration is, that just only the part of the limb removed distal to the level of a
in what part of the human body aschelminthes found?
Define Future challenges of management of renewable resources? In response to past shortcomings in a few fisheries management, and to dealing with other conservation goals
Q. Which cell organelles are well-developed in secretory cells? In secretory cells, like the secretory cells of endocrine glands, organelles related to production, "exportation
how many chromosomes in human
Chordal Sparing Operation : For sparing both leaflets, an incision is made on the anterior leaflet close to the annulus and then extended centrally and the two segments,
Is it more indicated for a geneticist desiring to map the X chromosome of the mother of a given family (the researcher does not have access to her DNA, only access to the genetic m
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