swer the following questions orally:
Why do animals reproduce?
Give a basic difference between a zygote and a foetus.
Name the organs of male and female reproductive system.
Why do animals undergoing external fertilization lay large number of eggs and sperms?
is the correct answer :
Answers
Like any other living thing, animals are born, grow, give birth to their own kinds, get old and die. ... Reproduction is very essential for the continuation of a species or a group of animal. It ensures the continuation of similar kind of individuals (animals) generation after generation.
The zygote is the initial stage in baby development. It is also known as a fertilized ovum formed from the union of the sperm cell and the egg cell. Foetus refers to the final stage in baby development. An embryo is termed as the foetus in the beginning in the 11th week of pregnancy.
The testes in the scrotum produce the male gamete, sperm, which is ejaculated in seminal fluid by the penis. The female reproductive system primarily consists of internal organs. The female gamete, ovum, is produced in the ovaries and is released monthly to travel to the uterus via the Fallopian tubes.
Out of hundreds of eggs laid by the female frog or fish, only a few will survive to become adult frogs or fish. Therefore the production of a large number of eggs is necessary to ensure the fertilisation of at least a few of them.