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  4. The blood of cockroach contains no respiratory pigment. It means that:

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Q. The blood of cockroach contains no respiratory pigment. It means that:

NTA AbhyasNTA Abhyas 2020Structural Organisation in Animals

Solution:

The blood of cockroach is present freely in haemocoel which is the body cavity of cockroach. It is a transparent fluid with no haemoglobin. O2 enters the haemocoel through the trachea and diffuses into the haemocoel directly.