Read the given statements and conclusions carefully. Assuming that the information given in the statements is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements.

Statement :

All Tress are flowers

All flowers are stem

Conclusion : I - All Tress are stem

                 II - All stem are Tress

                III - All stem are flowers

                 IV - Some stem are Tress