Number of alary muscles in Cockroach is

Twelve pairs

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Twelve

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Thirteen

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Thirteen pairs

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Solution

The correct option is A Twelve pairs
In cockroach, there is a dorsal diaphragm below the heart. It is perforated by many small apertures through which haemocoel communicates with pericardium. There are also 12 pairs of alary muscles attached to diaphragm. These are triangular and their pointed ends are inserted into terga.
So, the correct answer is 'Twelve pairs'.

Suggest Corrections

Column - I	Column - II
(a) Grinding of the food particles	(i) Hepatic caeca
(b) Secrete gastric juice	(ii) $10^{t h}$ segment
(c) 10 pairs	(iii) Proventriculus
(d) Anal cerci	(iv) Spiracles
	(v) Alary muscles