I concur with the answers:
1) If the CP (upward force) is in front of the CG (downward force) then the a/c will pivot down at the back.
2) The highwing = postive dihedral effect is related to sideslip. A low wing a/c is unstable in sideslip so dihedral is required to encourage stability by reducing AoA and hence lift on the lee wing (the wing pointing away from the sideward airflow). Because of the flow of air around the fuselage, with a high wing a/c the lee wing has a positive flow over the top and less airflow underneath reducing lift in that wing and stablising the bank.