What is the effect of an end rhyme scheme?

Well, first lets review the terms. The rhyme scheme of a poem is the pattern of its rhyming Words. The theme of a poem is its centralmessage, lesson, moral etc. The author's rhyme scheme can make the reader remember specific Words, these Words may be very important in the context of the poem. The rhyme scheme can also help the reader remember the most important Words that contribute to the theme. Or, the rhyme scheme might not have any significance in the poem.

Hope this helps =)