Sex determination in animals such as humans and insects is done using the XX-XO and XX-XY mechanisms. In some organisms ZZ-ZW mechanism of sex determination is seen.
Based on the given statement, answer the question given below.

XX-XO type of sex determination is found in ____________.
[1 mark]

The correct option is D grasshoppers
Grasshoppers have an XX-XO sex-determination system. Males only have one X chromosome (XO), while females have two X chromosomes (XX).
In hens and parrots: ZW-ZZ system is found, the ovum determines the sex of the offspring. Males are the homogametic sex (ZZ), while females are the heterogametic sex (ZW).
Drosophila has an XX-XY sex-determination system. Males have XY and females have XX chromosomes.
So, the correct answer is 'grasshoppers'.