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The function of leg haemoglobin in the root nodules of legumes is:

1. inhibition of nitrogenase activity
2. oxygen removal
3. nodule differentiation
4. expression of nif gene

Correct answer: oxygen removal

Solution

Leg haemoglobin keeps free oxygen levels very low in root nodules. This protects nitrogenase, which is highly oxygen-sensitive, while still allowing enough oxygen for respiration.

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