choose e correct option w.r.t. leg- haemoglobin

Options

A. Found in root nodules of grasses
B. Oxygen scavenger
C. Provides suitable conditions for nitrogenase activity
D. Both (2) and (3)

Answer

### Step-by-Step Solution

1. **Understanding Leg Hemoglobin**:
- Leg hemoglobin is a type of hemoglobin found specifically in leguminous plants. Its primary role is to facilitate oxygen supply to nitrogen-fixing bacteria present in root nodules.

2. **Function of Leg Hemoglobin**:
- The main function of leg hemoglobin is to act as an oxygen scavenger. It binds to oxygen, which prevents it from inactivating the enzyme nitrogenase. Nitrogenase is crucial for the process of nitrogen fixation, which allows plants to convert atmospheric nitrogen into a usable form.

3. **Color and Composition**:
- Leg hemoglobin is red in color due to the presence of iron, similar to other types of hemoglobin. The iron content is significant as it plays a role in oxygen binding.

4. **Evaluating the Options**:
- The first option states that leg hemoglobin is found in the roots of nodules of grasses. This is incorrect because leg hemoglobin is specifically found in leguminous plants, not in grasses (which are monocots).
- The second option describes leg hemoglobin as an oxygen scavenger, which is correct.
- The third option mentions that leg hemoglobin provides suitable conditions for nitrogenous activity, which is also correct.

5. **Conclusion**:
- Since the second and third options are correct, the final answer is that both options 2 and 3 are correct.