Question

Explain how, chicks are born. How much time does the embryo present in hen’s egg take to develop into a chick (when provided sufficient warmth) ?

Answer 1

Answer:

A chick emerges from a fertile egg after twenty-one days of incubation. The germinal disc is visible on the surface of the yolk. The development of the chick begins in the single cell formed by the union of two parental cells, egg and sperm, in the process known as fertilization.

Explanation:

After twenty days, the chick is in the hatching position, the beak has pierced the air cell, and pulmonary respiration has begun. After 21 days of incubation, the chick finally begins its escape from the shell. The chick begins by pushing its beak through the air cell.

Answer 2

Embryo development in chicken:

• The male gamete and female game fuse and undergo fertilisation process in hen.
• The zygote develops into embryo and travel down the oviduct. During this process many layers are formed around embryo.
• When the protective shell is formed, the egg is laid by hen.
• Hens sit on eggs to given sufficient warmth for the embryo for its development.
• When the embryo is complete is developed and becomes chicks. Later, it breaks the shell and comes out.

A typical egg takes 3 weeks to hatch.

• The embryo gets food from egg yolk and it gets oxygen through protective shell from environment.