Hybrid breeding have led to the development of several high yielding varieties that are

Options

A. resistant to drought stress
B. resistant to water stress
C. resistant to chemical stress
D. both (a) and (b)

Answer

To solve the question regarding hybrid breeding and the development of high-yielding varieties, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Hybrid Breeding**:
- Hybrid breeding involves the crossing of two or more different plant varieties to produce offspring (progeny) that exhibit superior traits. This process is aimed at enhancing certain characteristics such as yield, disease resistance, and environmental adaptability.

**Hint**: Think about what hybrid breeding is and how it works in agriculture.

2. **Identifying the Traits of High-Yielding Varieties**:
- High-yielding varieties developed through hybrid breeding are often designed to be resilient to various stresses. The question lists several types of stress: drought stress, water stress, and chemical stress.

**Hint**: Consider the types of environmental and chemical stresses that plants face and how breeding can help mitigate these issues.

3. **Evaluating the Options**:
- The options provided are:
- A) Resistant to drought stress
- B) Resistant to water stress
- C) Resistant to chemical stress
- D) Both A and B
- From the context of hybrid breeding, it is known that many high-yielding varieties are specifically bred to withstand both drought and water stress, particularly in regions where water availability is a concern.

**Hint**: Recall examples of hybrid crops that are known for their resilience to water-related stresses.

4. **Selecting the Correct Answer**:
- Given the information about hybrid breeding and its purpose, the best choice is D) Both A and B, as hybrid breeding has indeed led to the development of varieties that are resistant to both drought and water stress.

**Hint**: Think about the implications of high-yielding varieties in agriculture and how they are designed to cope with environmental challenges.

### Final Answer:
The correct answer is **D) Both A and B** - high-yielding varieties developed through hybrid breeding are resistant to both drought stress and water stress.