Human Reproductive System

Fertilisation is the fusion of male and female gametes with the mixing of the 23 male and 23 female chromosomes. The zygote has 46 chromosomes so they are diploid in nature.
Thus, the correct answer is option A.

Ejaculation is the discharge of semen, usually carrying sperms from the male reproductive tract during copulation.
Insemination is the introduction of a sperm into a female for fertilization.
Fertilization is the fusion of male and female gametes.
Parturition is the action of giving birth to young ones.
Thus, the correct answer is option A.

During fertilization, the haploid nuclei of the sperm and egg fuse to form a single diploid nucleus (the zygote nucleus), not two different nuclei.

The first step of fertilization is the penetration of the sperm into the egg, followed by the fusion of nuclei. The development of the zygote occurs after fertilization is complete.

Fertilization results in the formation of a single-celled zygote. The embryo is the developmental stage that follows subsequent cell divisions.

• During copulation (coitus) semen is released by the penis into the vagina (insemination). 
  
• The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the ampullary region of the fallopian tube.
• The ovum released by the ovary is also transported to the ampullary region of fallopian tube where fertilisation takes place. 
  
• So, the correct option is 'Fallopian tube'.

When the egg nucleus and the sperm nucleus unites in the fallopian tube, it results in fertilization. And it results in the production of zygote or fertilized egg. Maturation is completed during the the gametogenesis (before the formation of egg / sperm) and the polar body is also formed during this process.
Thus, the correct answer is option C.

Fertilization occurs when the nucleus of both, a sperm and an egg fuse to form a diploid cell, known as a zygote. A zygote is a diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum. An organism in the early stages of growth and differentiation, from fertilization to the beginning of the third month of pregnancy (in humans) is called as an embryo, after that, an embryo is called a fetus.

During copulation, semen is released by the penis into the vagina. The motile sperms swim rapidly, pass through the cervix, enter into the uterus and finally reach the junction of the isthmus and ampulla of the fallopian tube. the ovum released by the ovaries also transported to the ampullary-isthmus junction where fertilization takes place.

Sexual reproduction is the process wherein gametes both from male and female fuse together to give rise to a new progeny.
Steps involved in sexual reproduction :

• Male gametes are produced in male reproductive organ by the process called spermatogenesis in semeniferous tubules in gonads and female gametes are produced in female reproductive organ by the process called oogenesis in the ovaries. This process is called gametogenesis.
  

• The sperm (male gamete) enters the ovum (female gamete) by rupturing the cell wall of ovum and releases its chromosomal material in the ovum. This process is called fertilization. Wherein the egg is fertilized by a sperm.
  
• Fertilisation process brings together two sets of chromosome, one from female and one from male. Thereby forming a diploid cell called zygote. Hence called zygote formation.
  
• The newly formed zygote undergoes many cycles of cell division passing the stages from morula, blastula and giving rise to a multicellular structure called embryo through the process called embryogenesis.
  

Fertilization that takes place inside the female body is called internal fertilization. In human fertilization takes place in the oviduct. During fertilization motile sperm moves towards egg and fuse to form the zygote. Thus, the correct answer is option D.

Fertilization is the process of fusion of human egg and sperm. Where sperm enters through vagina and encounters the ovum for fusion in fallopian tube During fertilization acrosome reaction takes palce between the zona pallucida membrane and enzyme in acrosome. Thus, the correct answer is option B.

The steps of fertilization in humans always involve the joining of an egg and sperm. In natural conception, the male sperm fertilizes the female egg inside the woman’s body. While many think fertilization occurs in the ovary, it actually takes place in the fallopian tube just outside the ovary. From there, the fertilized egg travels down the fallopian tube. If it successfully implants in the uterus, an embryo can begin to grow.

• The fertilization process brings together two sets of chromosomes, one from female and one from the male.
•  The fusion of male and female gametes leads to the formation of zygote. It has a diploid set of chromosomes. 
• So, the correct answer is option A.

Fertilization is the fusion of male (sperm) and female gametes (ovum) and it takes place in the Fallopian tube. 
Therefore, the correct answer is option B.