Circulatory system of Cockroach is present

On dorsal side with 13 unit heart in abdomen

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On dorsal side with 10 abdominal and 3 thoracic units of heart

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On ventral side With 13 unit heart in abdomen

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On ventral, side with 10 abdominal and 3 thoracic units of heart

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Solution

The correct option is A On dorsal side with 10 abdominal and 3 thoracic units of heart
In Cockroach, the heart is arranged mid-dorsally. It is pulsatile and consists of 13 segmentally arranged funnel-shaped chambers. There are 10 units or chambers that are arranged abdominally and 3 thoracic units.
So, the correct answer is 'On the dorsal side with 10 abdominal and 3 thoracic units of heart'.

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