The correct sequence of spermatogenetic stages leading to the formation of sperms in mature human testis is
spermatocyte-spermatoogonia-spermatid-sperms
spermatogonia-spermatocyte-spermatid
spermatid-spermatocyte-spermatogonia-sperms,
spermatid-spermatocyte-spermatogonia-sperms,
B.
spermatogonia-spermatocyte-spermatid
In spermatogenesis, during growth phase some spermatogonia either due to growth or due to food storage become 2 or 3 times larger to their original size and are known as primary spermatocytes, which undergo meiosis- I and as result2 haploid secondary spermatocytes are formed.Further, meiosis-II takes place that results in the formation of 4- spermatids. Then, these round, non-motile and haploid spermatids are transformed into thread-like motile, haploid sperms (four).
In human adult females, oxytocin
is secreted by the anterior pituitary
stimulates the growth of mammary glands
stimulates pituitary to secrete vasopressin
stimulates pituitary to secrete vasopressin
Seminal plasma in human is rich in
fructose, calcium and certain enzymes
fructose and calcium but has no enzymes
glucose and certain enzymes but has no calcium
glucose and certain enzymes but has no calcium
In humans, at the end of the first meiotic division, the male germ cells differentiate into the
Primary spermatocytes
Secondary spermatocytes
spermatids
spermatids
Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Chorion
Allantois
Yolk sac
Yolk sac
