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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
ageing -the appearance of some changes as the body grows older is called ageing it ultinately leads to deathit can be defined as deteoration in
mechanism of regeneration -th morgan recognised 2 primary mechanisms -morpholaxisepim orphosis1 production of entire animal from a small fragmentit
types of regeneration -reparativerestorative1 it is limited to healing of wounds or replacement of cellsit can replace the lost part of body or
regeneration -natural ability of living being to replace worn out parts to repair damaged parts to regrow cost off organs amp to reform entire body
pattern of growth -1 isometric -in it an organ grows at the same rate as the rest of body external form of body is not
growth rate in animals -growth rate is different at different periods of lifegrowth period in human may be studied in 5 steps -i prenatal - in
kinds of growth -1 auxetic growth -body grows by enlargement of its cells without increase in number of cellseg nematodes
physiological condition for growth -it depends on anabolism and cetabolism if anabolism is more positive growthif both are balanced growth is zero if
growth at different levels -1 molecular level - it involves synthesis of new molecules and their aggregation into
significance of gastrulation -it results in the formation of three germ layersit also resutls in the formation of different organs amp organ