1. What is hydroponics? Name the element whose essentiality was proved for the first time using this technique.
2. What were the drawbacks of the nutrient solution prepared by Knop?
3. Name the scientists who gave the composition of the nutrient solution that contained micronutrients.
4. How is the problem of chelation solved in the nutrient solution being used for hydroponic culture currently?
5. What precautions are taken to protect the roots during hydroponic culture?
6. Why is the element magnesium very vital for plants?
7. What is interveinal chlorosis? It indicates the predominant deficiency of which element?
8. Of all the micronutrients, which element is required in greatest quantities? In which form is it available to plants?