During coitus, the human male ejaculates about

Fill in the blanks in the following statements: The human male ejaculates about ____ million sperms during a coitus of which, for normal fertility, at least ____ percent sperms must have normal shape and size and at least ____ percent of them must show vigorous motility.

Go through the following statements:- (i). Primary spermatocytes undergo mitotic divisions to produce secondary spermatocytes (ii). Sperms released from the seminiferous tubules are fuly mature and motile (iii) The head of sperm possesses may mitochondria which produce energy for the movement of tail (iv) The human male ejaculates about 20-30 million sperms during a coitus which of these are correct?

Go through the following statements:- (i). Primary spermatocytes undergo mitotic divisions to produce secondary spermatocytes (ii). Sperms released from the seminiferous tubules are fuly mature and motile (iii) The head of sperm possesses may mitochondria which produce energy for the movement of tail (iv) The human male ejaculates about 20-30 million sperms during a coitus which of these are correct?

Assertion : In barrier methods, ovum and sperms are prevented from physical meetings Reason : Barrier methods are used during coitus, to prevent the entry of ejaculated semen into the female reproductive tract.

Assertion : In barrier methods, ovum and sperms are prevented from physical meetings Reason : Barrier methods are used during coitus, to prevent the entry of ejaculated semen into the female reproductive tract.

Assertion : In barrier methods, ovum and sperms are prevented from physical meetings Reason : Barrier methods are used during coitus, to prevent the entry of ejaculated semen into the female reproductive tract.

Assertion : In barrier methods, ovum and sperms are prevented from physical meetings Reason : Barrier methods are used during coitus, to prevent the entry of ejaculated semen into the female reproductive tract.

With reference to the above schematic representation of (a) SQPermatogenesis and (b) Oogenesis answer the following questions: (a) About 300 million SQPermatozoa may be present in a human male ejaculation at one time. Calculate how many SQPermatocytes will be involved to produce 300 SQPermatozoa. (b) How many chromatids are found during Oogenesis in (i) Primary oocyte and (ii) First polar body in a human female?

With reference to the above schematic representation of (a) SQPermatogenesis and (b) Oogenesis answer the following questions: (a) About 300 million SQPermatozoa may be present in a human male ejaculation at one time. Calculate how many SQPermatocytes will be involved to produce 300 SQPermatozoa. (b) How many chromatids are found during Oogenesis in (i) Primary oocyte and (ii) First polar body in a human female?

In human males urethra has