In frog’s egg the plane cutting through entrance point, sperm path and median line of gray crescent represents:
A.Sagittal plane of future embryo
B.Anterior end of furture embryo
C.Tail of future embryo
D.None of these
Category: Embryo Genesis Mcqs
Most mammalian eggs have practically very little amount of yolk, the survival of their embryos is made possible by the fact that:
A.These are milk-fed
B.These are larger in size
C.These are nourished through placenta
D.They need no food
Mammalian ovum has which of the following coverings around it:
A.Zona pellucida
B.Corona radiata
C.Both of these
D.None of these
Which of these endocrine glands is endodermal in origin:
A.Pituitary gland
B.Adrenal gland
C.Thyroid gland
D.Pineal body
Actual embryo in mammals in formed by:
A.Embryonal knob
B.Hensen’s knot
C.Corona radiata
D.None of these
Tadpole of frog metamorphoses under the influence of:
A.Adrenaline
B.Thyroxine
C.Prolactin
D.Growth hormone
Mammalian placenta has:
A.A foetal part contributed by the embryo through allantois and chorion
B.A maternal part contributed by the mother through uterine wall
C.Both (a) & (b)
D.None of these
Addition of a trace of thyroid extract to water containing tadpole will:
A.Kill all the tadpoles
B.Keep them in larval stage
C.Accelerate their metamorphosis
D.Slow down their metamorphosis
Yolk plug in frog’s embryo appears during:
A.Morula formation
B.Blastula formation
C.Gastrula formation
D.Neurula formation
Which of these glands in frog initiate metamorphosis:
A.Thyroid
B.Thymus
C.Adrenal
D.Parathyroid
