Free download NCERT Solutions class 12 Biology PDF. CBSE books, exemplar problems biology and human welfare pdf biology, physics, chemistry, maths, guides, notes in PDF format. NCERT Solutions class 12 Biology PDF format is available to download. All the solutions and NCERT books are given chapter wise.
Solutions for other subjects Physics, Chemistry, Maths are also available to download. 2017-18 for more practice of subjects. NCERT solutions sections of each subject. Significance of seed dispersal and fruit formation. Down’s syndrome, Turner’s and Klinefelter’s syndromes. Improvement in food production: Plant breeding, tissue culture, single cell protein, Biofortification, Apiculture and Animal husbandry. In household food processing, industrial production, sewage treatment, energy generation and microbes as biocontrol agents and biofertilizers.
Red Data Book, biosphere reserves, national parks, sanctuaries and Ramsar sites. For the book by E. It argues that just as selection pressure led to animals evolving useful ways of interacting with the natural environment, so also it led to the genetic evolution of advantageous social behavior. Wilson defined sociobiology as “the extension of population biology and evolutionary theory to social organization”.
It begins with the idea that behaviors have evolved over time, similar to the way that physical traits are thought to have evolved. It predicts that animals will act in ways that have proven to be evolutionarily successful over time. This can, among other things, result in the formation of complex social processes conducive to evolutionary fitness. The discipline seeks to explain behavior as a product of natural selection. Behavior is therefore seen as an effort to preserve one’s genes in the population. For example, newly dominant male lions often kill cubs in the pride that they did not sire. Sociobiologists would view this instinctual cub-killing behavior as being inherited through the genes of successfully reproducing male lions, whereas non-killing behavior may have died out as those lions were less successful in reproducing.
However, the influence of evolution on behavior has been of interest to biologists and philosophers since soon after the discovery of evolution itself. 1890s, is a popular example. They contend that in order to fully understand behavior, it must be analyzed in terms of evolutionary considerations. Variants of hereditary traits which increase an organism’s ability to survive and reproduce will be more greatly represented in subsequent generations, i. However, there is continued resistance by some researchers over the application of evolutionary models to humans, particularly from within the social sciences, where culture has long been assumed to be the predominant driver of behavior.