What is the phenotypic ratio of a test cross in the $F_1$ generation of a dihybrid cross?

In peas,tallness is dominant over dwarfness and red colour of flowers is dominant over the white colour. When a tall plant bearing red flowers was pollinated with a dwarf plant bearing white flowers,the different phenotypic groups were obtained in the progeny in numbers mentioned against them:
Tall,Red $= 138$
Tall,White $= 132$
Dwarf,Red $= 136$
Dwarf,White $= 128$
Mention the genotypes of the two parents and of the four offspring types.

Which of the following depicts Mendel's dihybrid phenotypic ratio?

In plants,red fruit $(R)$ is dominant over yellow fruit $(r)$ and tall height $(T)$ is dominant over dwarf height $(t)$. If a plant with genotype $RRTt$ is crossed with a plant with genotype $RRTt$,what will be the phenotype of the offspring?

What will be the phenotypic ratio of the offspring obtained from a cross between $Aabb$ and $Ccdd$?

The law of dihybrid cross proves which of the following?