Cow is a viviparous animal whereas hens are oviparous animal. Organisms give birth to their young ones are called viviparous while those who lay eggs are called oviparous.
After the development of an embryo, hens sit on their eggs to provide warmth. This process is called incubation. They perform incubation to provide a suitable developing conditions by maintaining the temperature.
It is a method which is used to produce babies externally by mixing the ova and sperms collected from male and female. Babies born with this technique are called test-tube babies.
The period of developing the baby from fertilisation till the birth is called gestation or pregnancy period. In human beings, the average gestation is nearly 280 days.
The differences between internal and external fertilisation are as follows: -
The differences between viviparous and oviparous are as follows: -
The hen follows the internal fertilisation process to give birth. The formation of an embryo takes place in the oviduct after zygote divides repeatedly. After the development of an embryo, hens sit on their eggs to provide warmth. This process is called incubation. The embryo takes another three weeks to develop into a chick. After the chick is fully developed, it hatches the egg.
After mating, millions of sperms disperse and enters into the fallopian tube. Out of all these sperms, only sperm is successful to fertilise the egg to form a zygote. Afterwards, the zygote multiplies repeatedly to form a ball of cells. This ball of cells is called the embryo. Later, the embryo transfers into the uterus from the fallopian tube and attached to the wall of uterus.
This Reproduction in animals Class 8 Extra Questions is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.