Which one of the following living organisms gives litmus?
Lichen
Identifying the Living Organism that Provides Litmus
The question asks us to identify which of the given living organisms is the source of litmus. Litmus is a well-known indicator used to test whether a substance is acidic or alkaline.
Let's examine the options provided:
- Protozoa: These are single-celled eukaryotic organisms. While diverse, they are not known to produce litmus.
- Virus: Viruses are not typically considered living organisms as they require a host cell to reproduce. They do not produce litmus.
- Lichen: A lichen is a symbiotic association between a fungus (usually an ascomycete) and a photosynthetic partner, which is typically an alga or cyanobacterium. Lichens are known to produce a variety of unique biochemical compounds, including pigments and secondary metabolites. Certain species of lichens, particularly those from the genus Roccella, are historically and commercially important sources of litmus.
- Saccharomyces: This is a genus of yeast, which are a type of fungus. Saccharomyces cerevisiae is commonly known as baker's yeast or brewer's yeast. Yeasts are primarily used in fermentation processes and are not the source of litmus.
Based on this information, the living organism that gives litmus is lichen.
Litmus is extracted from certain species of lichens. It is a mixture of different dyes. In acidic solutions, litmus paper turns red, and in alkaline (basic) solutions, it turns blue. It is a classic example of a natural pH indicator.
| Organism | Association with Litmus |
|---|---|
| Protozoa | Not a source of litmus. |
| Virus | Not a living organism; not a source of litmus. |
| Lichen | Primary natural source of litmus. |
| Saccharomyces (Yeast) | Not a source of litmus. |
Revision Table: Key Facts about Litmus Source
- Litmus is a pH indicator.
- It is extracted from specific species of lichens.
- Lichens are a symbiotic relationship between a fungus and an alga/cyanobacterium.
- Species from the genus Roccella are well-known sources.
Additional Information on Lichens and Indicators
Lichens are fascinating organisms that can grow in diverse environments, often colonizing surfaces like rocks, trees, and soil. Their ability to produce unique chemical compounds has led to various uses throughout history, including:
- Dyes: Many lichens yield colorful dyes, used for dyeing textiles.
- Traditional Medicine: Some lichens have been used in traditional remedies.
- Air Quality Indicators: Lichens are highly sensitive to air pollution, particularly sulfur dioxide. Their presence or absence, and the species found, can be used to assess air quality. This makes them valuable bioindicators.
- Litmus Production: As discussed, specific lichens are the source of the litmus indicator, which is crucial for basic chemistry experiments to determine acidity or alkalinity.
Understanding the source of common lab materials like litmus helps connect biology with chemistry and appreciate the diverse applications of living organisms.
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