Q. An essential element is that which
A) Improves health of the plant
B) Is irreplaceable and indispensable for growth of plants
C) Is found in plant ash
D) Is available in the soil
Explanation
Essential element has following features: 1.It is indispensable for the growth of plants. 2.Cannot be replaced by any other element. 3.Absence/deficiency produces disorders. 4.Has nutritive value. 5.Necessary for completion of vegetative or reproductive phase. 6.These are- C, H, O, N, P, K, S, Mg, Ca, Fe, B, Mn, Cu, Zn, Mo and Cl.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.