Page 55 - Health, Population and Environment Education 10

18. Those factors which attract people to come to live in a particular place are called
pull factor.
19. Those factor which force people to leave a place and migrate to other places are
called push factors.
20. The total number of out migrants in 1000 mid year population in a place in a year is
called as out migration rate.
21. The difference between number of in-migrants and out migrants in 1000 mid year
population in a place in a year is called as net migration rate.
22. The sum of in-migrants and out-migrants in a place in a year is called as gross
migration rate.
23. Population doubling time can be defined as the time period required to double the
population if the annual population growth rate remains constant in the future as
well.
24. Dependency ratio can be defined as total number of dependent population in 100
independent population.
25. When the annual population growth rate is more that 2.1 % and total fertility rate
(TFR) of women is 2.1 per woman, it is regarded as rapid increase of population.
26. Deforestation leads towards the destruction or limitation of shelter place of wildlife,
rareness of wildlife, scarcity of underground water, lack of fresh air, occurrence
of natural calamities like flood, landslide, soil erosion as well as imbalance in
ecosystem and environment.
27. The population should be managed and the size of population should be maintained
based on available resources in the environment. Population management is the
process of making balance in the distribution of population so that the available
resources in environment can be effectively utilized.
28. People must treat son and daughter equally. Both of them should be provided with
equal opportunities in education, health, nutrition, training, etc.
29. Getting married only after physical and socio-economic empowerment is regarded
as marriage at appropriate age. It is better to get married at the appropriate age, i.e.
25-30 years for both males and females.
30. By adopting various contraceptive methods and using contraceptive devices,
people can ensure small family and remain happy in the family life.
31. Condom is temporary contraceptive device developed for males to avoid conception.
It is cylindrical in shape whose one end is open and another end is closed.
32. Those devices which are kept inside the uterus of females are called as Intra Uterine
Contraceptive Devices.
33. The method adopted in unprotected sexual relationship so as to avoid fertilization
between sperm and ovum is called as emergency contraceptive method.
34. The method in which the tubes that pass sperms in males and ovum in females are
cut and tied up is called as permanent contraceptive method.
35. Laparoscopy is the surgical procedure in which operation is done in the abdomen
and the fallopian tubes are tied up so as to avoid fertilization between sperm and
ovum.

GREEN Health, Population and Environment Education Book-10 55