Question

What is the difference between the embryo and the placenta?

Answer 1

Embryo:

1. When a male gamete unites with an egg cell, it forms zygote as a result of syngamy.
2. The embryo develops from the zygote at the embryo sac's micropylar end.

Placenta:

The placenta is a transient circulatory organ found in animals that connects the foetus to the mother's uterus during pregnancy.

Difference between the embryo and the placenta:

Embryo	Placenta
1. An embryo is a primitive stage of a live creature that has development potential.	1. The placenta is a transitory organ that joins the growing foetus to the uterine wall via the umbilical cord.
2. In mammals, it results from the blastocyst inner cell mass.	2. It is most common in placental animals.
3. Gastrulation, neurulation, and organogenesis occur during its development.	3. The placenta is divided into two parts: the maternal placenta and the foetal placenta.
4. It is formed after two to eleven weeks of fertilisation.	4. A placenta is formed around 7 to 10 days after conception.
5. The embryo develops to form foetus at 18th week of pregnancy.	5. It helps in the foetus's nutrition intake, gas exchange, waste removal, and thermoregulation.