Majority of the high yielding varieties of 'Indian rice' have been developed by cross between

Options

A. O. sativajaponicatimes O.sativaindica
B. O.sative indica times O. nivara
C. O.nivaratimes O.sativaianvonica
D. O.nivaratimes O.rufivogon

Explanation

**Step-by-Step Text Solution:**

1. **Understanding High Yielding Varieties (HYVs):**
High yielding varieties (HYVs) are those plant varieties that are bred to produce a greater number of grains or fruits per plant compared to traditional varieties. They are essential for improving food production and ensuring food security.

2. **Identifying the Genus:**
The genus for rice is Oryza. This is important because it helps us narrow down the specific species involved in the development of HYVs.

3. **Recognizing the Key Species:**
The majority of high yielding varieties of Indian rice have been developed primarily from two subspecies of Oryza sativa:
- Oryza sativa japonica
- Oryza sativa indica

4. **Understanding the Crossbreeding Process:**
The crossbreeding between Oryza sativa japonica and Oryza sativa indica has led to the development of many high yielding varieties. This hybridization combines desirable traits from both subspecies, resulting in improved growth, yield, and resistance to diseases.

5. **Conclusion:**
Therefore, the correct answer to the question is that the majority of high yielding varieties of Indian rice have been developed by the cross between Oryza sativa japonica and Oryza sativa indica.

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