The introduction of high-yielding varieties has transformed the cultivation of:

The correct answer is: d) All of the above

High-yielding varieties (HYVs) are crop plants that have been bred to produce more food per unit of land than traditional varieties. HYVs have been developed for a wide range of crops, including rice, wheat, and cotton.

The introduction of HYVs has had a major impact on agriculture around the world. HYVs have helped to increase food production and reduce hunger. They have also led to changes in agricultural practices, such as the use of more fertilizer and pesticides.

However, HYVs have also had some negative impacts. For example, they have led to the overuse of resources, such as water and land. They have also made farmers more dependent on external inputs, such as fertilizers and pesticides.

Overall, the introduction of HYVs has been a mixed blessing. They have helped to increase food production, but they have also had some negative impacts. It is important to weigh the benefits and costs of HYVs