The period of preparation with reference to developmental phenomena in vertebrates means
The period of preparation with reference to developmental phenomena in vertebrates means
- A
Formation of gastrula
- B
Formation of germ layers
- C
Tissue differentiation
- D
Parents preparation and elaboration of gametes
Similar Questions
Read the following paragraph with two blanks : Each testis has about $A$ compartments called as testicular lobules. Each lobule contains $B$ highly coiled seminiferous tubules in which the sperms are produced. The correct option for the two blanks is
$A$
$B$
Read the following paragraph with two blanks : Each testis has about $A$ compartments called as testicular lobules. Each lobule contains $B$ highly coiled seminiferous tubules in which the sperms are produced. The correct option for the two blanks is
| $A$ | $B$ |
$A$ : If both the ovaries are removed after the first trimester of pregnancy, still there would be normal growth of foetus.
$R$ : After first trimester placenta secretes sufficient progesterone
$A$ : If both the ovaries are removed after the first trimester of pregnancy, still there would be normal growth of foetus.
$R$ : After first trimester placenta secretes sufficient progesterone
After gastrulation the roof of archenteron is formed by
After gastrulation the roof of archenteron is formed by
Which of the embryo has parasite mode of nutrition.
Which of the embryo has parasite mode of nutrition.
The sperm produces substances of enzymatic nature called sperm lysin. In mammals, it is called
The sperm produces substances of enzymatic nature called sperm lysin. In mammals, it is called