Which of the following is not a beneficial element?

What are essential elements for plants? Give the criteria of essentiality. How are minerals classified depending upon the amount in which they are needed by the plants?

Which among the following is the major constituent of proteins,nucleic acids,vitamins and hormones?

How many macronutrients are absorbed from the soil in the form of minerals?

In which of the following,all three are macronutrients?

Which element is required by plants in large quantities?