A heterozygous plant is crossed with a homozygous dominant plant. what percentage will be homozygous

50% will be homozygous.

Heterozygous is Pp while Homozygous is PP so creating a punnet square with Heterozygous on top and Homozygous on bottom it will come out too 2 of them being Homozygous dominant and two being heterozygous. So 50% Homozygous