For “yellow seed”: The contrasting trait is “green seed”, with yellow being the dominant trait and green being the recessive trait.
For “round seed”: The contrasting trait is “wrinkled seed”, with round being the dominant trait and wrinkled being the recessive trait.
In summary, the contrasting pairs are:
Yellow seed vs. Green seed and Round seed vs. Wrinkled seed.
In pea plant the gene for yellow seed colour is dominant over green and round seed shape is dominant over wrinkled.