What are the suggested reasons for population explosion ? 

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The following are the suggested reasons for population explosion :

1. Decline in death rate like maternal mortality rate (MMR) and infant mortality rate (IMR).

2. Increase in number of people in reproducible age.

3. Increase in birth rate and improved medical facilities which in turn increases the longevity of an individual.

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Yes, sex education is necessary and  should be encouraged in schools to give right information to the young minds to ward off the prevailing myths and misconceptions about sex and related aspects.
It ensures education about reproductive organs, adolescence and related changes, safe and hygienic sexual practices, sexually transmitted diseases like AIDS which in turn  helps them to lead a reproductively healthy life. 

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Reproductive health in a society is very important as it ensures that all individuals in the reproductive age group are fertile and able to carry on human race further. Since reproductive health involves an all around health of the species be it emotionally ,physically or behavioural its helps to free the society from many negative aspects like uncontrolled population. sexual abuses , sex related crimes. As people are well aware and educated it helps to ward off the myths and misconception and helps prevent STDs and AIDS . Thus it helps to build up a socially responsible and healthy society.

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Yes, reproductive health in our country has tremendously improved in the past 50 years .The following are some areas of improvement -:

1. Increased awareness among the people about sex related aspects.

2. Rapid decline in death rate of the mother and the infant due to medically assisted deliveries and better post-natal care facilities.

3. Success of programmes like family planning and more and more couples having small families.

4. Better care and detection of STDs.

5. Improved medical facilities available for all the sex-related issues.

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There are numerous assisted reproductive technologies (ART) available which can help infertile couples to have  children. They are :

(1) IVF-In Vitro Fertilization (Test tube babies). followed by where the sperm and ova are collected from the donors and the fertilized in a laboratory followed by ET-embryo transfer.

(2)The zygote or early embryo can be transferred by two methods: ZIFT-Zygote Intra Fallopian Transfer or IUT-Intra Uterine transfer

(3) In vivo fertilisation where fusion of gamete from donor takes place inside a female.

(4) GIFT-Gamete Intra Fallopian Transfer where ova is tranfered from fallopian tube of donor female to another female.

(5) ICSI-Intra Cytoplasmic Sperm Injection, AI-Artificial insemination and IUI-Intra uterine insemination where sperm from a donor is introduced into ovum, vagina and uterus of the female respectively.