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The pink colour proteinaceous pigment th...

The pink colour proteinaceous pigment that acts as an oxgen scavenger is absent in all, expect :

A

Nostoc

B

Anabaena

C

Pisum sativum

D

Ginkgo

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**Step-by-Step Solution:** 1. **Understanding the Question**: The question asks for a pink-colored proteinaceous pigment that acts as an oxygen scavenger, which is absent in all options except one. We need to identify which option contains this pigment. 2. **Identifying the Pigment**: The pink pigment referred to in the question is known as leghemoglobin. This pigment is specifically found in the root nodules of leguminous plants. 3. **Function of Leghemoglobin**: Leghemoglobin serves as an oxygen scavenger. It helps maintain anaerobic conditions in the root nodules, which is essential for the nitrogen-fixing bacteria (like Rhizobium) that live in symbiosis with leguminous plants. 4. **Identifying Leguminous Plants**: To answer the question, we need to determine which of the given options is a leguminous plant. Leguminous plants are part of the family Fabaceae and include various species, such as peas, beans, lentils, etc. 5. **Analyzing the Options**: Among the options provided, we need to check which one is a legume. The example given in the transcript is *Pisum sativum*, commonly known as green pea, which is a leguminous plant. 6. **Conclusion**: Since leghemoglobin is present in the root nodules of leguminous plants, and among the options, *Pisum sativum* is the only legume, it is the correct answer. **Final Answer**: The pink color proteinaceous pigment that acts as an oxygen scavenger is present in *Pisum sativum*. ---
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