"fruit of the poisonous tree" doctrine,Exclusionary Rule , Plain View

1.  Searches without a search warrant are presumed "unreasonable", name and describe the exceptions to the search warrant requirement?

2.  What is the rationale for the Plain View exception to the search warrant requirement?

3.  What is the rationale for the automobile exception to the search warrant requirement?

4.  If the police obtain evidences as a result of an illegal search and seizure, this evidence can be excluded from trial under the "fruit of the poisonous tree" doctrine.  Explain why this doctrine is important?

5.  Describe the Exclusionary Rule and explain why this rule is important to a defendant?