A chemical fertilizin is produced from
polar bodies
middle piece of sperm
acrosome
mature eggs
Select the correct statement.
Cleavage follows gastrulation
Yolk content in egg has no role in cleavage
Cleavage is repeated mitotic division of zygote
Gastrulation and blastulation are followed by each other
In gastrulation, which is/arc formed ?
endoderm
mesoderm
ectoderm, endoderm
ectoderm, mesoderm, endoderm
Cleavage in frog’s zygote is
Diploblastic
Heteroblastic
Holoblastic
Meroblastic
Which is formed in gastrulation?
Archeenteron
Heart
Brain
None of these
If a germ cell in a female gonad and a germ cell in a male gonad begin undergoing meiosis simultaneously, what will be the ratio of ova and sperms produced?
1:1
l : 2
1:4
2:1
If the size of a fertilized egg of frog is compared with the size of its blastula and gastrula stages, which of the following observations will be correct ?
There is a progressive increase in size from zygote to blastula to gastrula ; '
All the three will be of the same size
Zygote will be smaller, while blastula and gastrula will be larger
Gastrula will be larger, while zygote and blastula will be of same size
During embryonic development, endoskeleton and muscles develop from which germinal layer?
Ectoderm
Endoderm
Mesoderm
Blastopore
Which of the following is correct?
Mesoderm - Brain
Ectoderm - Liver
Mesoderm - Skeleton
Endodermis - Epidermis
Spermatogenesis is induced by
FSH
ACTH
ICSH
ATH
