Explain chlorosis and give its cause. Describe the role of copper.
Chlorosis is the condition in which green plants turn yellow. It is caused by the deficiency of elents like N, K, Mg, S, Fe, Mn, Zn and Mo.
Role of copper :
Copper is absorbed as cupric ions (Cu2+). It is essential for the overall metabolism in plants. It is associated with certain enzymes involved in redox reactions.
How is nitrogenase enzyme protected ?
The nitrogenase enzyme is very sensitive to the molecular oxygen. It requires anaerobic conditions to work. The leg-haemoglobin in the nodule acts as an oxygen scavenger just meainting the anaerobic condition needed by the enzyme.
Hidden hunger refers to a situation in which a crop needs more of a given nutrient yet has shown no deficiency symptoms. The nutrient content is above the deficiency symptom zone but still considerably needed for optimum crop production