Which element is required by plants in large quantities?

An element must be considered essential,when
$I.$ the element is necessary for supporting normal growth and reproduction of the plants
$II.$ the deficiency of that particular element can not be met by supplying some other element
$III.$ the element is directly involved in the metabolism of the plants. Choose the correct pair

$A$ : All the diverse mineral elements found in plants are not essential for them.
$R$ : Some plants accumulate heavy and toxic minerals such as gold and selenium from the soil.

Which of the following elements is not essential for plant growth?

In which of the following,all three are macronutrients?

An essential element is one that: