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natural control of population growth -1 biotic potential -it is capacity of population to increase its number by
characteristics of population -each population envolves adaptations suited to its own localitypopulation is unit of evolutionpopulation is also an
demography -scientific study of vital amp social statistics such as births deaths disease etc of human population is called demographyit deals with
population was defined by clarke in 1954the term population refers to the total number of individuals of a sp occupying a particular geographic aera
skin grafting -skin for grafting is taken from another part of body of the same personsnow it is possible to grow a sheet of skin in culture from a
bone marrow transplant -it is transplanted to treat leukemiahere graft itself causes immune rejectionbefore transplant the recipients bone marrow
organ transplant rejection -major histocompatibility complex is responsible for stimulating the rejection of tissue mhc is set of genes that code for
transplantation -it is implanting of a living or preserved tissue or organ from one site to another side in the same individual or from one
phobias -common phobias for -spiderslizardssnakescockroachcrowded placesvast open placesclosed small
psychosocial problems -1 accidental injury -automobile accidents are no 1 killers of adolescents as they drive often
adolescence -it is the period of growth from the onset of puberty to the completion of growth amp maturity it extends between 12- 20 yrsit is a
chorionic villus sampling cvs -cvs is done during 8th-10th week of pregnancy when abortion is safefor cvs cells are sucked into a catheter passed
amniocentosis -transabdominal aspiration of fluid from the amniotic sac of the foetus is called amniocentesis it is prenatal diagonestic technique to
test tube baby -ova are fertilized in laboratory dish in vitra containing a nutrient brothit may be artificial insemination donor aid artificial
permanent method -1 vasectomy in male2 tubectomy in female3 leproscopy is used in tubal ligation to ligate fallopian
birth control -birth control methods which deliberately prevent fertilization are contraceptionthese methods may be temporary or
maternity and child health amp family planning -1 the health centers give necessary information guidance amp assistance to
world conservation strategy proposes the following steps -1 preservation of critical habitats2
causes of extinction -1 hunting -man started hunting wild animlas for food and safety trade and fun it may be subsistence
extinction -it refers to disappearance of a species from earth when its last surviving member diesorganic evolution not only creats new sps but
why conserve wild life 1 economic importance of wild life - i plants -ii animals -iii micro organisms
economic importance of wild life - i plants -produce foodprovide timber paper gums drugs pigments fibres rubber oils condiments amp fuelrelease
death -it is terminal end of the degeneration changes of old agedeath occurs when vescular system amp respiratory system stop workingfailure of
theories of ageing -1 compromise theory2 wear amp tear theory3 somatic mutation