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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 about a pink-colored proteinaceous pigment that acts as an oxygen scavenger, which is absent in all except one specific group of plants. 2. **Identifying the Pigment**: The pink-colored pigment referred to in the question is known as leghemoglobin. This pigment is crucial in certain plants as it helps to maintain an anaerobic environment, which is essential for the functioning of the nitrogenase enzyme involved in nitrogen fixation. 3. **Role of Leghemoglobin**: Leghemoglobin functions by binding to oxygen, thus preventing it from interfering with the nitrogen-fixing process in root nodules of leguminous plants. This is important for the survival of nitrogen-fixing bacteria, such as Rhizobium, that reside in the root nodules. 4. **Identifying Leguminous Plants**: Leguminous plants are a family of plants known as Fabaceae, which includes pulses like peas, beans, and lentils. The question requires us to identify which of the given options is a leguminous plant. 5. **Evaluating the Options**: - **Nostoc**: This is a genus of cyanobacteria, not a leguminous plant. - **Anabaena**: Another genus of cyanobacteria, also not a leguminous plant. - **Pisum sativum**: This is the scientific name for the common pea, which is a leguminous plant. - **Zingo**: This does not correspond to any known leguminous plant. 6. **Conclusion**: Based on the evaluation of the options, the only leguminous plant present in the options is **Pisum sativum**. ### Final Answer: The pink color proteinaceous pigment that acts as an oxygen scavenger is absent in all except **Pisum sativum**. ---
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KMnO_4 is prepared from the mineral pyrolusite, MnO_2 (deep purple colour). It acts as an oxidising agent in the neutral, alkaline as well as acidic medium in acidic medium it is used in volumetric analysis for estimation of Fe^(2+) , Cr_2O_4^(2-) salts etc. The titrations are carried out in presence of H_2SO_4 . However, before using it as a titrant, it is first standardised with standard oxalic acid solution or Mohr's salt solution . In one of the experiments on titration 26.8g of dry pure sodium oxalate (Mw=123gmol^-1) was dissolved in 1L of distilled water and then 100 mL of 2MH_2SO_4 were added. The solution was cooled. Now to this solution 0.1MKMnO_4 solution was added till a very faint pink colour persisted. Q. The purple colour of KMnO_4 is due to

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