RuBisCO stands for

Options

A. Ribulose Bisphosphate Carboxylase Oxygenase
B. Ribulose Phosphate Carboxylase Oxygenase
C. Ribulose Phosphate Carboxylic Oxygenase
D. None of the above

Answer

**Step-by-Step Solution:**

1. **Identify the Enzyme**: The question asks for the full form of the enzyme known as RuBisCO.

2. **Understand the Function**: RuBisCO is an enzyme that plays a crucial role in the process of photosynthesis in plants. It is involved in the fixation of carbon dioxide.

3. **Recognize Its Abundance**: RuBisCO is noted to be the most abundant enzyme in the biosphere, highlighting its significance in plant biology and the global carbon cycle.

4. **Determine the Full Form**: The full form of RuBisCO is "Ribulose bisphosphate carboxylase/oxygenase." This indicates that it has dual functions: it can act as a carboxylase (fixing carbon dioxide) and as an oxygenase (adding oxygen).

5. **Explain the Dual Role**: The enzyme acts as a carboxylase under normal conditions, fixing carbon dioxide into organic molecules. However, under high oxygen concentration and temperature, it can also act as an oxygenase, which can lead to a less efficient process known as photorespiration.

6. **Conclude the Answer**: Therefore, the full form of RuBisCO is Ribulose bisphosphate carboxylase/oxygenase.

**Final Answer**: RuBisCO stands for Ribulose bisphosphate carboxylase/oxygenase.

---