Answer:
The given statement is True.
Step-by-step explanation:
It is true that a noun clause does not function as a modifier.
A modifier is an optional element in a clause structure which tends to change, clarify or limit a particular word in a sentence in order to add detail, emphasis or explanation.
Therefore, noun clauses can not function as modifiers, because unlike the adjectives and adverbs, they cannot stand alone on their own.