Healthy root nodules are pink in colour as they contain leghaemoglobin.
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  • Brainly User
Yes healthy root nodules are pink in colour
because  they contain  leg haemoglobin 
leghaemoglobin means haemoglobin which is in the mammalian blood
this leghaemoglobin helps the plant by absorbing oxygen which inhibit the enzymes in the nodule that fix  nitrogen into soluble form
root nodules without pink colour are likely to be parasitic on the host plant rather than symbiotic........
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