The gestation period of rabbit is
$28-32$ days
$20-25$ days
$60-70$ days
$80-90$ days
In mammalian sperm, spirally arranged mitochondria are present in
Failure of descending testis into scrotum is known as
Assertion : Death is one of the important regulatory process on earth.
Reason : It avoids over-crowding caused by continuous reproduction.
How many chromosome numbers are present in primary spermatocytes of human ?
During embryonic development the establishment of polarity along anterior / posterior, dorsa l/ ventral or medial / lateral axis is called