When a sculpture is designed to be viewed from one side, and protrudes dynamically from its background plane or is carved with deeply incised marks, this is called .

High relief.

Explanation:

'High relief' also known as 'alto-relievo', the term that is employed to characterize an art work or sculpture when 'at least half or more from the circumference of its background' is displayed by ignoring the areas that are undercut. Such sculptures are composed to be viewed from one side as only half i.e. 50% of the natural depth of the sculpture is displayed to the viewers which is projected from the background plane dynamically and sculpted with deeply engraved marks. Thus, it is categorized as 'high-relief' sculpture.

any school based questions?

ill have to say true. hope this