Yellow giants with masses included between 1.8 and 3.5 solar masses develop thick outer 
convection zones as they rapidly traverse the G spectral type zone of the H-R diagram. Their 
increasing convection zone depth combined with fast rotation trigger dynamo processes that 
generate solar-like magnetic phenomena including large starspots. I investigated the 
possibility of detecting extra-solar planet transits in the photometric lightcurves of these 
stars in spite of their high level of magnetic activity. Simulation of planetary transits 
were conducted using the Corot instrument response and taking into account rotational 
modulation effects by stellar active regions. I describe the main properties of the 
exo-planets that could be detected.