Which of the following are the species that are crossed to give sugarcane varieties with high sugar, high yeild, thick stems and ability to grow in the sugarcane belt of North India ?

Options

A. Saccharum robustum and Saccharum officinarum
B. Saccharum barberi and Saccharum officinarum
C. Saccharum sinense and Saccharum officinarum
D. Saccharum barberi and Saccharum robustum

Explanation

To answer the question regarding which species are crossed to produce sugarcane varieties with high sugar content, high yield, thick stems, and the ability to grow in the sugarcane belt of North India, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Desired Characteristics**:
- The sugarcane varieties should have high sugar content, high yield, thick stems, and the ability to thrive in the North Indian climate.

2. **Review the Given Options**:
- The species provided are:
- Saccharum robustum
- Saccharum barbari
- Saccharum officinarum
- Saccharum sinensis
- Saccharum officinarum (duplicate)
- Saccharum barbari (duplicate)
- Saccharum robusta

3. **Analyze Each Species**:
- **Saccharum officinarum**: Known for high sugar content and thick stems, but does not grow well in North India.
- **Saccharum barbari**: This species is adapted to grow well in North India.
- **Saccharum robustum**: Generally does not grow well in North India and does not have the desired characteristics.
- **Saccharum sinensis**: Not specifically noted for high sugar or yield in the context of North India.

4. **Determine the Correct Cross**:
- The hybrid variety that combines the desirable traits is formed by crossing **Saccharum officinarum** (for high sugar and yield) with **Saccharum barbari** (for adaptability to North Indian conditions).

5. **Conclusion**:
- The correct answer is the combination of **Saccharum officinarum** and **Saccharum barbari**.

### Final Answer:
The species that are crossed to give sugarcane varieties with high sugar, high yield, thick stems, and the ability to grow in the sugarcane belt of North India are **Saccharum officinarum** and **Saccharum barbari**.

---