Match column I and column II regarding cockroach and choose the correct option.

	Column I		Column II
(a)	Compound eye	i.	Grinding mill
(b)	Gizzard	ii.	Chitinous asymmetrical structures
(c)	Mandible	iii.	Ommatidia
(d)	Phallomeres	iv.	Grinding, incising region

	(a)	(b)	(c)	(d)
1.	iii	i	iv	ii
2.	iii	i	ii	iv
3.	iv	iii	ii	i
4.	ii	iii	iv	i

Ommatidia are the structural and functional units of the compound eye in the cockroach. Each compound eye has 2000 ommatidia.

Gizzard helps in grinding of the food. It is present in the foregut of cockroach.

Mouthparts of cockroach are biting and chewing type. Mandible helps in mastication of the food. 

Phallomeres are the chitinous asymmetrical structure which are a part of male external genitalia in cockroach. They are copulatory structures.