Which of the following is a recessive trait for garden pea plant?

The correct answer is Option (2) → Constricted pod

Mendel studied seven pairs of contrasting traits in the garden pea. In each pair, one trait appeared in all the F₁ plants: that is the dominant trait. The other trait was hidden in F₁ and came back in about one-fourth of the F₂ plants: that is the recessive trait.

Option (2) Constricted pod — Correct. For pod shape, inflated (full) is dominant and constricted is recessive. A constricted pod appears only in a plant with two recessive alleles. Round seed, tall plant and violet flower are the dominant traits of their pairs.