Understanding High-Yielding Crop Varieties

The question asks us to identify the crop to which the high-yielding, semi-dwarf varieties named Java and Ratna belong. High-yielding varieties (HYVs) are types of crops specifically bred to produce significantly more yield than traditional varieties under similar growing conditions.

These varieties played a crucial role in the Green Revolution, which aimed to increase agricultural production worldwide, particularly in developing countries. The development of semi-dwarf varieties was important because taller plants are more prone to lodging (falling over) due to heavy grain yield, especially in windy conditions or with heavy rain. Semi-dwarf varieties are shorter and sturdier, making them better suited for high-yield cultivation with adequate fertilization and irrigation.

Java and Ratna: Important Rice Varieties

The varieties 'Java' and 'Ratna' are well-known examples of high-yielding, semi-dwarf varieties developed in India. They were part of the effort to improve rice production significantly.

• Ratna: Developed in 1966 at the Central Rice Research Institute (CRRI), Cuttack. It is a cross between T(N)1 and HR 12.
• Java: Also an important semi-dwarf high-yielding rice variety developed through breeding programs.

These varieties, along with others like IR8, contributed greatly to increasing rice production, making India self-sufficient in this staple food.

Analyzing the Options

Let's look at the given options:

1. (a) Wheat: Wheat also saw significant increases in yield during the Green Revolution with the introduction of semi-dwarf varieties like Sonalika and Kalyan Sona, which were derived from Mexican wheat varieties developed by Dr. Norman Borlaug. However, Java and Ratna are not varieties of wheat.
2. (b) Maize: Maize (corn) production also benefited from improved varieties and hybrid technology, but Java and Ratna are not associated with maize.
3. (c) Rice: As discussed, Java and Ratna are indeed well-known high-yielding, semi-dwarf varieties of rice.
4. (d) Millet: Millets include crops like sorghum, pearl millet, and finger millet. While improved varieties of millets exist, Java and Ratna are not names typically associated with millet varieties.

Based on agricultural history and plant breeding knowledge, Java and Ratna are specifically recognized as varieties of rice.

Conclusion on Java and Ratna

Therefore, the high yielding semi-dwarf varieties Java and Ratna are varieties of Rice.

Revision Table: High-Yielding Varieties

Additional Information: Green Revolution and HYVs

The Green Revolution was a period of rapid increase in agricultural production, primarily in wheat and rice, due to the introduction of new technology, including high-yielding varieties (HYVs), irrigation, fertilizers, and pesticides. Dr. Norman Borlaug, often called the "Father of the Green Revolution," developed semi-dwarf wheat varieties that significantly increased yields.

Inspired by the success in wheat, similar efforts were made in rice. The International Rice Research Institute (IRRI) in the Philippines played a key role in developing high-yielding rice varieties like IR8. These international efforts, combined with national breeding programs in countries like India, led to the development of varieties like Java and Ratna, specifically adapted to local conditions.

The introduction of HYVs led to several changes:

• Increased food grain production, helping to avert famine in many countries.
• Reduced dependence on food imports.
• Changed farming practices, requiring more inputs like fertilizers and water.
• Economic and social impacts on rural communities.

Understanding the role of specific HYVs like Java and Ratna helps us appreciate the advancements made in agriculture and their impact on global food security.