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Q.

In cockroach, blood enters the heart through

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a

aorta

b

ostia

c

caeca

d

fenestrae

answer is B.

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Detailed Solution

The heart of cockroach consists of elongated muscular tube lying along mid-dorsal line of thorax and abdomen. It is differentiated into funnel-shaped chambers with ostia on either side. Blood from sinuses enter heart through ostia.

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