Q.In which of the following group of countries of the world, HYVs of wheat and rice were developed?

The Green Revolution: From Empty Plates to Full Granaries

Imagine India in the early 1960s. The country was dependent on food aid from other nations. A bad monsoon meant empty stomachs. Farmers used traditional seeds that gave modest yields, and the land could barely keep up with a growing population. Something had to change.

That change came in the form of a scientific and agricultural transformation known as the Green Revolution.

The Core Intuition

The central idea was deceptively simple: make each plant produce far more grain than it ever had before.

Think of a traditional wheat plant. It grows tall, with a thin stem and a small head of grain. When the wind blows or when the grain gets heavy, the plant often falls over (lodging), ruining the crop. The plant spends a lot of its energy growing a tall stalk, not the grain you actually want to eat.

Now imagine a different plant. It is short and sturdy, with a thick stem. It puts almost all its energy into producing a massive, heavy head of grain. It doesn't fall over. It can handle more water and more fertilizer without getting sick. This is the heart of the Green Revolution.

The Precise Statement

The Green Revolution refers to a period (roughly the mid-1960s to the 1980s) of rapid increase in global agricultural production, driven primarily by the development and widespread adoption of high-yielding varieties (HYVs) of staple crops, especially wheat and rice, combined with the intensive use of chemical fertilizers, pesticides, and improved irrigation.

The Three Pillars That Made It Work

The revolution wasn't just a new seed. It was a system. Three things had to come together:

1. The Seed (The Magic Ingredient): The breakthrough was a dwarfing gene. Scientists, most famously Dr. Norman Borlaug, bred wheat plants that were short and stiff-strawed. These dwarf varieties could hold a much heavier grain head without falling over. They also responded much more efficiently to fertilizers. A traditional seed given extra fertilizer would just grow taller and fall. An HYV seed given the same fertilizer would convert it directly into more grain.

2. The Fertilizer (The Fuel): Traditional farming relied on natural manure, which provided limited nutrients. The new seeds were like high-performance engines. They needed a precise and abundant supply of nitrogen, phosphorus, and potassium — provided by chemical fertilizers. Without fertilizer, the HYVs performed no better than traditional varieties.

3. The Water (The Lifeline): The new seeds were not drought-tolerant. They needed a reliable, controlled water supply. This meant building dams, canals, and tube wells for irrigation. A farmer could no longer just pray for rain; they needed to control the water. …