Scientific name of sunflower is :

Options

A. Hibiscus rosa-sinensis
B. Solanum nigrum
C. Helianthus annuus
D. Oryza sativa

Answer

To determine the scientific name of the sunflower, we can follow these steps:

### Step-by-Step Solution:

1. **Classification of Sunflower**:
- First, we need to classify the sunflower within the biological taxonomy. The classification hierarchy is as follows:
- **Kingdom**: Plantae
- **Phylum**: Magnoliophyta
- **Class**: Magnoliopsida
- **Order**: Asterales
- **Family**: Asteraceae
- **Genus**: Helianthus
- **Species**: Annus

2. **Understanding Scientific Naming**:
- In scientific nomenclature, the name of an organism is typically composed of two parts: the genus name followed by the species name. This system was developed by Carl Linnaeus.

3. **Combining Genus and Species**:
- For the sunflower, the genus is **Helianthus** and the species is **annus**. Therefore, the full scientific name is written as **Helianthus annus**.

4. **Evaluating Options**:
- Now, we can evaluate the provided options to find the correct scientific name of the sunflower:
- Option A: Hibiscus rosa-sinensis (This is incorrect; it refers to the hibiscus plant).
- Option B: Solanum nigrum (This is incorrect; it refers to black nightshade).
- Option C: Helianthus annus (This is correct; it is the scientific name of sunflower).
- Option D: Oryza sativa (This is incorrect; it refers to rice).

5. **Conclusion**:
- Based on the classification and evaluation of options, the scientific name of the sunflower is **Helianthus annus**.

### Final Answer:
The scientific name of sunflower is **Helianthus annus**.