Correct answer is option 'A', "production of wheat and rice". The Green Revolution of the 1960s was a period of rapid agricultural development in India, characterized by the introduction of high-yielding varieties of wheat and rice, the use of modern agricultural techniques, and increased government investment in the agricultural sector. This led to a significant increase in crop yields, particularly for wheat and rice, which were the main staple crops of the country. The Green Revolution also helped to improve food security, increase rural incomes, and reduce poverty in India. This initiative was led by Dr. Norman Borlaug and it brought India from being a food deficit country to a food surplus country. This revolution was a turning point in Indian agriculture and food security.

The Green Revolution in the 1960s was associated with the production of wheat and rice. It was a period of significant agricultural advancements that aimed to increase food production and alleviate hunger and poverty in developing countries, particularly in Asia and Latin America.

1. Definition of the Green Revolution:
The Green Revolution refers to a series of technological advancements and agricultural practices that resulted in a significant increase in agricultural productivity. It involved the development and adoption of high-yielding crop varieties, increased use of chemical fertilizers and pesticides, and improved irrigation techniques.

2. Focus on Wheat and Rice:
The Green Revolution primarily focused on the production of wheat and rice because these two crops were the staple food for a large population in developing countries. By developing high-yielding varieties of these crops, scientists and agricultural experts aimed to increase their productivity and ensure food security.

3. Development of High-Yielding Varieties:
During the Green Revolution, scientists developed high-yielding varieties of wheat and rice through a process called hybridization. These new varieties had improved characteristics such as disease resistance, shorter growth cycles, and higher yields. They were able to produce more grain per unit of land compared to traditional varieties.

4. Increased Use of Chemical Inputs:
Another key aspect of the Green Revolution was the increased use of chemical fertilizers and pesticides. These inputs were used to provide essential nutrients to the crops and protect them from pests and diseases. The use of fertilizers and pesticides, along with improved irrigation techniques, helped to maximize the productivity of wheat and rice crops.

5. Impact on Food Production:
The Green Revolution had a significant impact on food production. The introduction of high-yielding varieties and the use of chemical inputs resulted in a substantial increase in crop yields. This increase in productivity helped to meet the growing demand for food in developing countries and reduce reliance on food imports.

In conclusion, the Green Revolution in the 1960s was primarily associated with the production of wheat and rice. The development and adoption of high-yielding varieties, along with the increased use of chemical inputs, revolutionized agricultural practices and played a crucial role in increasing food production and alleviating hunger in developing countries.

Option a is correct