I concur with DFC. It's simple and the standard CFS A2 answer.
It's quite noticeable on the aircraft I did my A2 on, the Chipmunk. Wings at 4 degrees, tailplane at zero. One thing we noticed was that the students often bounced on their first solo. This was due to the c of g being further forward (without the weight of their often quite portly instructors) a greater elevator input being required, therefore greater longitudianl dihedral, therefore more pitch stability being encountered and touching down mainwheels first - leading to a bounce.