Modern Farming Methods:

Modern farming methods have played a significant role in increasing agricultural productivity and meeting the growing food demands of the world population. These methods incorporate various techniques and practices that enhance crop production and improve overall efficiency. One such method is the use of high-yielding variety (HYV) seeds and chemical fertilizers.

High-Yielding Variety (HYV) Seeds:
- High-yielding variety (HYV) seeds are one of the key components of modern farming methods.
- These seeds have been selectively bred to exhibit improved characteristics such as high yield potential, resistance to diseases and pests, and adaptability to different climatic conditions.
- HYV seeds have revolutionized agriculture by significantly increasing crop yields.
- They are capable of producing more grains per plant, leading to higher productivity and improved food security.
- Examples of HYV seeds include hybrid varieties of crops like wheat, rice, maize, and vegetables.

Chemical Fertilizers:
- Chemical fertilizers are another crucial aspect of modern farming methods.
- These fertilizers are manufactured synthetically and contain essential nutrients like nitrogen (N), phosphorus (P), and potassium (K) in concentrated forms.
- The use of chemical fertilizers ensures that crops receive an adequate and balanced supply of nutrients required for their growth and development.
- They enhance soil fertility and improve plant nutrition, thereby increasing crop yields.
- Chemical fertilizers are easy to apply and provide quick and predictable results.
- However, their indiscriminate and excessive use can have negative environmental impacts, such as soil degradation and water pollution.

Multiple Cropping:
- Multiple cropping is a traditional farming method that involves growing two or more crops on the same piece of land in a single growing season.
- It allows farmers to maximize the utilization of available resources and increase agricultural output.
- By planting crops with different growth cycles and complementary nutrient requirements, farmers can optimize the use of sunlight, water, and nutrients.
- Multiple cropping also helps in pest and disease management, as different crops act as natural barriers against specific pests and pathogens.
- However, multiple cropping is not a modern farming method in itself, as it has been practiced for centuries.

Conclusion:
In conclusion, among the given options, both the use of high-yielding variety (HYV) seeds and chemical fertilizers are considered modern farming methods. These techniques have significantly contributed to increasing agricultural productivity and addressing the global food demands. However, it is important to ensure the judicious use of these methods to minimize their potential negative impacts on the environment and human health.