Sulphate uptake by plants is through

Which can function as a carrier in active ion absorption?

Minerals are absorbed by plants in

In which of the following forms is iron absorbed by plants?

Phosphorus and nitrogen ions are generally leached from the soil because they are usually in the form of:

$A$ : Most minerals must enter the root by active absorption into the cytoplasm of epidermal cells.
$R$ : Minerals are present in the soil as charged particles.