Explanation
$$\textbf{Correct option:C}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A)}$$
$$\bullet$$ Population explosion is the rapid increase in the population of a given area ,over a relatively small period of time .
$$\bullet$$ Emigration is when individuals from one population go out to another place, this leads to loss of certain genes in the gene pool. Population size decreases
$$\textbf{Option (B)}$$
$$\bullet$$ Mortality rate is the number of individuals dying in a unit time ,it is thus also known as death rate.Population size decreases due to mortality rate. This tends to increase the population size.
$$\textbf{Option (C)}$$
$$\bullet$$ Natality rate is the average number of new individuals produced by a population reproductively active in a unit time. It is also known as birth rate.
$$\textbf{Option (D)}$$
$$\bullet$$ Immigration is when individuals from one population migrate to another,this introduces new alleles in the gene pool of a population. Population size increases.
$$\textbf{Hence, the correct option is (C)}$$
Which of the following factors were responsible for the period of stagnant growth of India's population from 1901-1921?
Poor health and medical services.
Illiteracy of people at large.
Inefficient distribution system of food and other basic necessities.
$$\bullet$$ When couples are unable to conceive a child due to incurable disorder ,then they are assisted through some special technologies to have children .These are commonly known as Assisted Reproductive Technologies(ART).
$$\bullet$$ IVF stands for in vitro fertilization. In this process,ovum is collected from the female and semen is collected from the male,and these gametes are fused to form a zygote outside the body in almost similar conditions as that found in the female body.
$$\bullet$$ When the zygote produced after the fusion of collected gametes is let to divide several times to create 8 blastomeres ,at this stage it is transferred to the fallopian tube this is known as ZIFT(zygote intra fallopian transfer ).
$$\bullet$$ Intrauterine transfer is when the zygote divides to produce more than 8 blastomeres stage then it is directly transferred to the uterus.
$$\textbf{Correct option:B}$$
$$\bullet$$ During Internal fertilization, the body of a female have a healthy reproductive system due to which fusion of gametes takes place inside the ampullary-isthmic region of fallopian tube and results in the production of zygote which then gets implanted in the uterus for further development.
$$\bullet$$ IVF stands for in vitro fertilization. In this process,ovum is collected from the female and semen is collected from the male ,and these gametes are fused to form a zygote outside the body in almost similar conditions as that found in the female body.
$$\bullet$$ Option (b) is only correct.
$$\bullet$$ Option (b) is correct.
$$\textbf{Hence, the correct option is (B)}$$
A.Correct option D B.Explanation for correct option:
The National Institute of Health and Care Excellence definition of infertility is
Fluid discharge, slight pain and swelling in genital region are the early symptoms of
Which of the following is not a sexually transmitted disease?
Correct answer: D Explanation:
Principle to lower the risk of getting sexually transmitted disease is
The causative agent of genitalia herpes is
The most common bacterial sexually transmitted disease is
In which method, collected ovum and sperm are placed inside the woman's oviduct?
A man with spinal cord injuries becomes father because of
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