Is there any significance to this rhyming scheme?

I'm dong a reading assignment in my advanced Enlgish class for William Shakespeare's, "A Midsummer Night's Dream". My teacher is having us write 50-75 word commentary on selected quotes, and there's one that I'm stuck on.

"What thou seest when thou dost wake,
Do it for thy true love take.
Love and languish for his sake.
Be it ounce, or cat, or bear,
Pard, or boar with bristled hair,
In thy eye that shall appear
When though wak'st, it is thy dear.
Wake when some vile thing is near."

She wanted us to pay close attention to the rhyming scheme and said there's a name for a specific literary device for it, buuuut I obviously have no clue what that is.
Any suggestions? :P
 
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