Large numbers of new varieties have been developed through mutation breeding and it has been used commonly in

Options

A. Self pollinating crops
B. Cross pollinating crops
C. Allogamous plants
D. More than one option is correct

Answer

### Step-by-Step Solution:

1. **Understanding Mutation Breeding**: Mutation breeding is a technique used to create new varieties of plants by inducing mutations, which can lead to desirable traits such as increased yield, disease resistance, or improved quality.

2. **Identifying Pollination Types**: Pollination can be categorized into self-pollination and cross-pollination:
- **Self-Pollination**: Pollen from the same flower or plant fertilizes the ovule. This results in offspring that are genetically similar to the parent.
- **Cross-Pollination**: Pollen from one plant fertilizes the ovule of another plant. This introduces genetic variation.

3. **Analyzing the Options**: The question provides four options regarding the types of crops where mutation breeding has been commonly used:
- Option 1: Self-pollinating crops
- Option 2: Cross-pollinating crops
- Option 3: Allogamous plants (which are typically cross-pollinating)
- Option 4: More than one option is correct

4. **Determining the Correct Option**:
- Self-pollinating crops tend to accumulate homozygosity, leading to inferior traits over generations. Therefore, mutation breeding is particularly beneficial for these crops to introduce superior traits.
- Cross-pollinating crops and allogamous plants already have genetic variation, making mutation breeding less critical for them.

5. **Conclusion**: The most appropriate answer is **Option 1: Self-pollinating crops**, as mutation breeding is primarily used to enhance the genetic diversity and quality of these crops.