CBSE
LH and FSH are collectively called
oxytocin
samatotrophins
luteotropic
gonadotropins
How many sperm cells are present in an average (3 mL) ejaculation?
200 million
300 million
400 million
500 million
Due to alcohol abuse, brain-related disease Korsakkoff’s syndrome occurs. Which nutrient is responsible for this syndrome?
Vitamin-B12
Fat
Protein
Vitamin-B1
The extra structure that provides nutrition to the embryo is
umbilicus
amnion
chorian
placenta
In human, during fertilization, a sperm firstly comes in contact with which layer of the ovum
Zona pellucida
Vitelline membrane
Jelly coat
Zona radiata
Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?
Chorion
Allantois
Yolk sac
Amnion
The middle piece of the sperm contains
Proteins
Centriole
Nucleus
Mitochondria
The number of chromosomes in a primary spermatocyte is
Same as in spermatid
Same as in spermatogonium
Help of that in spermatogonium
Same as in secondary spermatocyte
In case of pregnancy, the heartbeat of embryo starts at
4th week
7th week
6th week
5th week
Prothallus of the fern produces
Spores
Gametes
Both (a) and (b)
Cones