________ हे एकपेशीय प्रथिनाचे उदाहरण नाही.

The correct answer is Option C (Euphorbia).

Key Points:
• Core Concept
• Single Cell Protein (SCP) refers to edible unicellular or simple multicellular microorganisms (algae, fungi, yeast, bacteria) cultured as protein-rich human food or animal feed supplements.
• Why Correct
• Microorganisms commonly cultivated for SCP include:
• 1. *Spirulina* (blue-green alga/cyanobacteria)
• 2. *Yeast* (e.g., *Saccharomyces cerevisiae*, *Candida utilis*)
• 3. Fungi/mushrooms such as *Agaricus bisporus* (often processed microbially for mycoprotein/SCP formulations)
• In contrast, Euphorbia is a genus of flowering vascular, multicellular green plants (family Euphorbiaceae), renowned as 'petro-crops' producing latex/hydrocarbons, completely unrelated to Single Cell Protein.
• Key Details
• SCP is harvested for high protein content (40–80% dry weight), rapid biomass growth, and low land-use requirements.
• Exam Traps
• Do not confuse petro-plants like *Euphorbia* with microbial protein sources.
• Other Options
• Spirulina (Option 2) and Yeast (Option 4) are textbook single-cell proteins.
• Agaricus (Option 1) represents fungi cultivated for protein-rich biomass.
• Key Takeaway: Euphorbia is a multicellular flowering petro-plant, not a Single Cell Protein (SCP) like Spirulina or yeast.