In a plant's life cycle, the diploid stage is known as . n phase. b. the sporophyte. c. alternation of generations. d. the gametophyte. reset selection

B. the sporophyte.

Explanation:

Plants employ the phenomenon of ALTERNATION OF GENERATIONS in their life cycle i.e. they alternate between a diploid state and haploid state. This diploid state (2n) of a plant is called SPOROPHYTE. The sporophyte is the dominant form of a plant's life cycle. The

diploid sporophyticc body of a plant produces haploid spores via meiotic division.

These haploid spores germinates to form the haploid state of the plant called GAMETOPHYTE. The GAMETOPHYTE is responsible for producing the haploid gametes (sperm and egg) that fuses to form a diploid ZYGOTE (2n) which eventually grows and develop into the diploid SPOROPHYTE. The cycle repeats in that manner.