NTA Abhyas NEET2020BotanyMineral NutritionPractice
Essential elements are
Options
- ANot required for normal reproduction
- BNot replaceable by other elements
- CNever directly involved with metabolism
- DRequired only in those metabolic processes responsible for biomass growth.
Correct answer
B. Not replaceable by other elements
Step-by-step solution
The criteria for the essentiality of an element are given below: (i) The element must be absolutely necessary for supporting normal growth and reproduction. In the absence of the element the plants do not complete their life cycle or set the seeds. (ii) The requirement of the element must be specific and not replaceable by another element. In other words, deficiency of any one element cannot be met by supplying some other element. (iii) The element must be directly involved in the metabolism of the plant.