In which of the following animal blood is red coloured without RBC?

Earthworm

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Cockroach

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Frog

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Dugesia

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Solution

The correct option is A Earthworm
The blood of earthworm is red coloured due to presence of a respiratory pigment haemoglobin, it is not contained in the corpuscles like vertebrates but is found dissolved in the plasma.
So, the correct option is 'Earthworm'.

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