Which does not show `HSK` pathway

Options

A. Maize
B. Jowar
C. Sugarcane
D. Sunflower.

Answer

To determine which plant does not show the HSK pathway (Hatch-Slack pathway), we need to analyze the options provided in the question: maize, jowar, sugarcane, and sunflower.

### Step-by-Step Solution:

1. **Understanding HSK Pathway**:
- The HSK pathway, also known as the Hatch-Slack pathway, is a photosynthetic pathway found in C4 plants. It is named after the scientists Hatch and Slack who discovered it.

2. **Identifying C4 Plants**:
- C4 plants are typically adapted to dry tropical regions and have a specific mechanism for carbon fixation that allows them to efficiently utilize CO2 even in conditions where it is limited.

3. **Analyzing the Options**:
- **Maize**: This is a well-known C4 plant and therefore undergoes the HSK pathway.
- **Jowar**: Also known as sorghum, jowar is another C4 plant and will also undergo the HSK pathway.
- **Sugarcane**: This is yet another example of a C4 plant that utilizes the HSK pathway.
- **Sunflower**: Unlike the previous three options, sunflower is not a C4 plant; it is classified as a C3 plant and does not undergo the HSK pathway.

4. **Conclusion**:
- Based on the analysis, the plant that does not show the HSK pathway is **sunflower**.

### Final Answer:
The correct answer is **sunflower**.

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