Ejaculation of human male contains about $200 -300$ million sperms, of which for normal fertility ____ $\%$ sperms must have normal shape and size and at least ____$\%$ must show energetic motility.
$40, \,60$
$50, \,50$
$60, \,40$
$30, \,70$
Assertion : Head of sperm consists of acrosome and mitochondria.
Reason : Acrosome contains spiral row of mitochondria.
$A$ -Spermatids formed from secondary spermatocytes.
$R$ -The spermatids are transformed into spermatozoa by the process called spermiogenesis.
Insemination is
Movement of sperm is done by
Draw a labeled diagram of a section through ovary.