what is dwarf planet?

Which of the following is dwarf planet?

Which planet is considered as the Dwarf planet? (A) Earth (B) Jupiter (C) Pluto (D) Saturn

Heterozygous tall plants were crossed with dwarf plants. What will be the ratio of dwarf plants in the progeny :-

Heterozygous tall plants were crossed with dwarf plants. What will be the ratio of dwarf plants in the progeny