2nd cleavage in frog’s egg begins after:
A.30 minutes of 1st cleavage
B.60 minutes of 1st cleavage
C.90 minutes of 1st cleavage
D.120 minutes in frog’s egg begins after
Category: Embryo Genesis Mcqs
Internal ear is derived from ectoderm of the embryo but middle ear and Eustachian tube are derived from:
A.Endoderm of the embryo
B.Mesoderm of the embryo
C.Both (a) & (b)
D.None of these
Accomodation of trophoblastic villi into uterine wall in mammals marks the:
A.Conception
B.Ovulation
C.Parturition
D.None of these
Liver and pancreas are endodermal in origin whereas spleen is:
A.Ectodermal
B.Mesodermal
C.Both (a) & (b)
D.None of these
Which of the following when added to pond water will accelerate the rate of metamorphosis in tadpoles:
A.Chlorine
B.Broming
C.Iodine
D.Flourine
Fully grown tadpole breathes mainly with the help of:
A.Skin
B.Lungs
C.Gills
D.Skin and lungs both
During metamorphosis the intestine of tadpole shrinks:
A.1/3rd in length
B.2/3rd in length
C.3/4 in length
D.1/2 in length
Prechordal area in frog’s blastula is the part from which:
A.Tail of the tadpole is formed
B.Mesodermal and endodermal parts of the phyaryngeal region are derived
C.Notochord is derived
D.None of these
Which of the following parts of excretory system are endodermal in origin:
A.Kidneys
B.Urinary bladder
C.Both (a) & (b)
D.None of these
Cleavage differs from mitosis in that:
A.It occurs in all body cells
B.It occurs only in zygote
C.It results into haploid cells only
D.It results into unidentical cells
