19. Alternating row and cover crops a. Contour Plowing b. Terracing c. Strip cropping 20. Disease caused by Jack of iron in the diet

19. Alternating row and cover crops<br />a. Contour Plowing<br />b. Terracing<br />c. Strip cropping<br /><br />The correct answer is c. Strip cropping. Strip cropping involves planting different crops in narrow strips or rows, alternating between row crops and cover crops. This method helps in reducing soil erosion, improving soil fertility, and promoting biodiversity.<br /><br />20. Disease caused by lack of iron in the diet<br /><br />The correct answer is anemia. Anemia is a condition that occurs when the body lacks enough healthy red blood cells to carry adequate oxygen to the body's tissues. This can be caused by a deficiency of iron, which is essential for the production of hemoglobin, the protein in red blood cells that carries oxygen. Symptoms of anemia include fatigue, weakness, shortness of breath, and pale skin. Iron-rich foods such as lean meats, poultry, fish, beans, and fortified cereals can help prevent or treat anemia.