‘All elements that are present in a plant need not be essential to its survival’. Comment.

Which of the following statements are true? If false, correct them: (a) Boron deficiency leads to stout axis. (b) Every mineral element that is present in a cell is needed by the cell. (c) Nitrogen as a nutrient element, is highly immobile in the plants. (d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities.

Why is water essential for plants ?

In a way green plants and cyanobacteria have synthesised all the food on the earth. Comment.