What is the importance of iambic pentameter?

Question 1 options:

it tells the rhyme scheme of the poem

it reveals the meaning of the poem

it suggests the speaker of the poem

it explain the rhythm of the poem

The answer is the fourth option: it explains the rhythm of the poem.

Rhythm, in terms of poetry, is expressed through stressed and unstressed syllables. In poetry, iamb is defined as a foot or a beat. It consists of an unstressed syllable followed by a stressed syllable. Penta - means five, so if a line of poetry is written in iambic pentameter it would have 5 feet of unstressed and stressed syllables alternating.