a) Why has improving crop yields become important these days?b) Mention the major groups of activities for improving yield.c)Which one of these activities is most important and why?

a) Improving crop yields has become important these days due to several reasons. Firstly, the global population is increasing rapidly, which means more food is required to feed everyone. Secondly, climate change and environmental degradation are affecting the productivity of land, making it harder to grow crops. Thirdly, there is a need to increase agricultural productivity to reduce poverty, especially in developing countries where agriculture is a major source of income.

b) The major groups of activities for improving yield include:

• Crop management: This involves practices like crop rotation, intercropping, and use of cover crops to maintain soil health and reduce pest and disease incidence.

• Use of improved varieties: Scientists are constantly developing new varieties of crops that are more productive, disease-resistant, and climate-resilient.

• Nutrient management: This involves the use of fertilizers and other soil amendments to provide crops with the nutrients they need to grow.

• Pest and disease management: This involves the use of pesticides, biological control methods, and other strategies to reduce losses from pests and diseases.

• Irrigation: Providing crops with water when rainfall is not sufficient can greatly increase yields.

• Post-harvest management: Proper handling, storage, and processing of crops after harvest can reduce losses and increase the amount of food available.

c) It's hard to say which one of these activities is most important as they all play a crucial role in improving crop yields. However, one could argue that the use of improved varieties is particularly important. This is because the development of new varieties that are more productive, disease-resistant, and climate-resilient can help farmers increase their yields significantly, even in challenging conditions. Furthermore, once a new variety is developed, it can be used by farmers all over the world, potentially benefiting millions of people.