What are the blastopore?

1

When are archenteron and blastopore formed?

1

In which type of animals does the placenta exist? What is its main function?

5

Explain gastrulation? What stage follows gastrulation?

1

How during gastrulation are the first two germ layers formed? Which are these germ layers?

1

What are the archenteron?

1

Nmae extra embryonic membranes layers in vertebrates?

1

What are the functions of umbilical cord?

1

How yolk sac is formed?

1

Explain pleura?

1

How is the neural tube formed? What is the embryonic origin of the nervous system in vertebrates?

1

What are the cells produced in the first stage of the embryonic development called?

5

Explain monozygotic and dizygotic twins?

1

What is the germ layer from which the coeloms originate?

5

What are the animal pole and the vegetal pole of the vertebrate egg?

5