Chorion is composed of
Cytotrophoderm
Syncytial trophoblast
Outer ectoderm and somatic mesoderm
All the above
In determinate cleavage, the spindle is
In some eggs, future organs can be demarcated even before cleavage begins. This type of development is called
The hormones of the sperm are called
If the nuclei from an $8$-celled stage of an embryo are transplanted into enucleated eggs, which of the following events is likely to occur
When a small piece of dorsal lip of blastopore of frog's early gastrula is transplanted into another gastrula of similar age at ventral lip, the result is