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  • In plants, mineral elements are called macro or microelements depending upon theirOption: 1 Relative presence in ash<div class='qna-opt

In plants, mineral elements are called macro or microelements depending upon their

Option: 1

Relative presence in ash


Option: 2

Relative importance in plant growth


Option: 3

Relative amount required in plants


Option: 4

Relative availability in soil


Answers (1)

best_answer

 

 

The criteria for the essentiality of an element are given below:

1. 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.

2. 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.

3. The element must be directly involved in the metabolism of the plant.

Based upon the above criteria elements are divided into two broad categories based on their quantitative requirements:

  • Macronutrients
  • Micronutrients
     

-

 

 Hence, the correct answer is option c.

Posted by

Pankaj

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