Question

explain sexual mode of reproduction in humans . Class X .. With diagram (will mark brainliest)
Fastttt​

Answer 1

Sexual mode of reproduction: It involves the union of two opposite sex cells by the process of fertilisation to give rise to zygote, the single cell. This type of reproduction involves two organisms, the male and the female. Reproductive organs in humans produce gametes - eggs and sperms. Egg is the female gamete produced by female reproductive organ. Sperms are male gametes produced by male reproductive organ. A zygote is the future individual formed by the fusion of an egg and a sperm.

Male reproductive system: This system includes a pair of testis, vas deferens and a muscular organ, the penis.

Testes are placed in a structure called as scrotum which is located outside the abdominal cavity. Scrotum helps in keeping the testes at lower temperatures. Testes produce the male gametes known as sperms.

Sperms are the male gametes possessing a head, body and a tail.

Testosterone is the male sex hormone secreted by the testes. It regulates the development of sperms and the secondary sexual characteristicsleading to puberty.

The vas deferens is a tube that carries sperm from the testes. It continues from the epididymis as a tube.

Prostate gland and seminal vesicles secrete semen to make the movement of sperms easier.

The urethra forms a common passage for both the sperm and urine as it is just one tube that connects both the glands – urinary bladder and vas deferens.

Female reproductive system: This system includes a pair of ovaries, a pair of oviducts, uterus and vagina opening out through urethra.

Eggs, the female gametes develop inside the ovaries. One mature egg is released by either of the ovaries in a month.

Ovaries secrete two hormones namely estrogen and progesterone which bring about secondary sexual characters in females.

The egg is carried from the ovary to the uterus through a thin oviduct also known as the fallopian tube.

The two oviducts combine and open into an elastic bag-like structureknown as the uterus. The uterus opens into vagina through cervix. The uterus helps in the development of the foetus.

Copulation: It is the act in which a male reproductive organ enters the female reproductive tract to discharge the male gametes.

Fertilisation: It involves the fusion of male and female gametes to give rise to a single cell – zygote. Fertilisation can be external fertilisation or internal fertilisation.

Zygote: It is the super cellformed by the fusion of pronuclei of male and female gametes. It divides repeatedly to form an embryo. Embryo gets implanted in the lining of the uterus for further development.

Answer 2

Reproduction in human beings is by sexual reproduction where both the male and female gametes fertilize to give rise to an embryo. The fertilization of human embryo occurs inside the body of the female. Thus, it is called Internal Fertilization. Human Beings are viviparous organisms who give rise to Embryos directly instead of laying eggs. Let us understand a little more about the male and female reproductive organs and the process of fertilization in them.