Answer: Option B. -> False
:
B
Menstruation, also known as a period or monthly, is the regular discharge of blood and inner lining of uterus through the vagina. The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. The onset of menstruation is calledmenarche while permanent stoppage of menstruation is termed as menopause.

Answer: Option A. -> Fertilisation – P, implantation – R
:
A
P, Q, R and S are the fallopian tube, ovary, uterus and vagina respectively.
In the process of fertilisation, a mature ovumis released from either one of the ovaries. The sperm or the male gamete travels into the uterus and into the fallopian tube where the fertilisation takes place. After the fusion of the male and the female gamete, a fertilised egg or the zygote is formed. Gradually this zygote gets implanted into the wall of the uterus where the baby develops and gets its nourishment from the mother.

Answer: Option C. -> Vas deferens
:
C
Vas deferens is a part of the male reproductive system. It is a duct that carries sperms from epididymis to copulatory organ. Along the way, secretions from seminal vesicles and prostate glands are added to the sperms. Ovary, uterus, fallopian tubes are parts of the female reproductive system.

Answer: Option A. -> One pair of the ovary in females and one pair of the testis in males 
:
A
One pair of ovaries and testis are present in human females and males respectively. Ovaries produce ovum and sperm is produced by the testis. Ovum is the female gamete and sperm is the male gamete. Ovum and sperm fuse to form the zygote.

Answer: Option B. -> ovum, sperm
:
B
The egg cell, or ovum (plural ova), is the female reproductive cell (gamete) in sexually producing organisms. The egg cell is typically not capable of active movement, and it is much larger (visible to the naked eye) than the sperm. The motile germ cell is sperm. The primary function of the sperm is to pass on the necessary biological information required to produce a new organism. This is true for all the organisms which reproduce sexually.

Answer: Option B. -> To ensure continuity of their species.
:
B
Reproduction, compared toother life processes such asrespiration, digestion, circulationetc., is not that vital and essential to maintain life of an organism. Morover,the process of reproduction takes more energy in comparision. Despite that, It is still a crucial process as it ensurescontinuity oftheir species in the biosphere.

Answer: Option B. -> Kala azar
:
B
Visceral leishmaniasis(VL), also known askala-azar and black fever, is the second-largest parasitic killer in the world. It is a disease transmitted by the sandfly. The other three diseases namely Warts, Syphilis and Gonorrhoea are sexually transmitted diseases(STD).

Answer: Option A. -> True
:
A
Human fertilization is the union of a human egg and sperm, usually occurring in the fallopian tube. The result of this union is the production of a zygote cell, or fertilized egg. This is an important event of sexual reproduction. The fertilized egg eventually develops to become the offspring.

Answer: Option B. -> stigma
:
B
Pollination is the transfer of pollen grains from the anther of one flower to the stigma of the same or another flower. Pollen grains contain the male gamete and are present in the anthers of the flower. If the pollen grains land on the sticky surface called stigma of a suitable flower of the same species, a chain of events happen that ends in the development of seeds. The pollen grain on the stigma, grows a tiny tube, all the way down the style to the ovary. The ovary develops into a fruit after fertilisation.

Answer: Option D. -> Fallopian Tube
:
D
Fallopian tube connects ovaries to the inner side of uterus.The main function of the fallopian tube is to transport the egg from the ovary to the uterus.