What are the symptoms of having a displacement menical root tear? I am under the impression that a displacement menical root is a tear? Am I right?

No. A displacement can be an anatomical variant, and is not the same as a tear.
Knee pain. Medial knee pain especially with squatting. Mechanical symptoms such as locking or recurrent swelling may also be present. Yes a meniscal root tear is a variant of a meniscal tear.