Popl depends on –
Biotic potential = reproduction – capacity to produce offspring under naturalendi.
Carrying Capacity = All environments can carry only a limited size of population & is constant.
Prevent ovulation – mala D = daily.
Prevent ovulation – saheli = Weekly.
Malthus – population grow geometrically, food – arthimetically.
Malthus essay on human popl - in popl a) decrement b) increment in birth.
JRD Tata – 1992 united nations popl a ward.
Copper T, loop, spiral, ring, bow, shield.
Mech birth control devices – condoms (male), cervical caps (female), diaphragm (female), IVDS.
Cervical caps -> prevent sperm from entering uterus.
Abortion = MTP.
Combined pills (estrogen & progesterone) o=inhibit overlation by inhibiting normal release of FSH & LH from pituitary.
Abstinonce (a voidance of sex) – to refrain from indulgence.
Test tube baby – embryo transplanted at 32 celled stage in mother’s womb.
Amino centesis prior sonography to avoid damage to foetus & placenta sex, chr abnormality, engymatic abnormality (phemyl ketourea)
Birth control – Permanent (a) Vascetomy – cut in vasa deferentia.
(b) tubectomy – cut in sallopian tube.
(c)tubal ligation – tying of sallopian tube.
Electric pube – male contraceptive.
Spermacidal cream – lactic acid, boric acid, citric acid, ZnSo4, KMno4, neem oil.
Water detected on moon, Europa of Jupiter & Titan of Saturn.
Biopoiesis = Origin of life.
Biogeny = Origin of first life.
Biogenesis = Origin of life from life.