Grey crescent is the area
at the point of entry of sperm into ovum
just opposite to the site of entry of sperm into ovum
at the animal poles
at the vegetal pole
B.
just opposite to the site of entry of sperm into ovum
The grey crescent is a crescent- like and grey coloured area developing on the surface of amphibian egg opposite to the point of sperm entry. It is a surface feature developing as a result of cytoplasmic movements stimulated by sperm entry in the egg.
If mammalian ovum fails to get fertilized which one of the following is unlikely?
Corpus luteum will disintegrate
Estrogen secretion further decreases
Primary follicle starts developing
Progesterone secretion rapidly declines
Sertoli cells are found in testis. These cells are
nurse cells
reproductive cells
receptor cells
None of the above
Refer to the given figure and choose the correct option regarding its parts labelled as A-F
B-Graafian follicle, F-Corpus luteum
C-Graafian follicle, A-Ovum
B-Primary follicle, C-Tertiary follicle showing antrum
E-Corpus callosum, D-Antrum cavity
The immediate cause of induction of ovulation in female is the large plasma surge of
progesterone
estradiol
LH
FSH
