ICSE Class 8 Answered

Ovary

Testis

Primary sex organ in females 

Primary sex organ in males 

Produces eggs

Produces sperms

Secretes hormones such as estrogen (which imparts female secondary sexual characters) and progesterone (which maintains pregnancy).

Secretes hormone testosterone which imparts male secondary sexual characters.

Remains functional up to 50 years of age.

Remains functional even more than 70 years of age

Zygote

Embryo

Unicellular

Multicellular

Formed by the process of fertilisation

Formed by the process of embryogenesis

First stage in the development of a new organism

Stage that follows the zygote stage