In a plant's life cycle, how many sporophyte generations occur between one gametophyte generation and the next time that eggs and sperm are produced? A) Zero B) One C) Two D) Four

A) Zero

Explanation:

Alternation of generations in plants:

The 'alternation of generations' in the life cycle is between a diploid (2n) generation of sporophytes and a haploid (n) generation of gametophytes.

The following are the events involved in alternation of generations:

Two haploid gametes with n chromosomes, fuse to form a diploid zygote i. e. 2n chromosomes in total. The diploid zygote germinates, dividing by mitosis to produce a multi-cellular diploid organism, called the sporophyte (because at maturity it produces spores). When it matures, the sporophyte produces one or more sporangia that produce diploid spore mother cells (sporocytes). These divide by meiosis, reducing the number of chromosomes by a half. This results in four haploid spores, each containing n unpaired chromosomes. The haploid spore germinates, dividing by mitosis, maintaining the number of chromosomes at n. This results in a haploid organism, called the gametophyte (because it produces gametes at maturity). When it matures, the gametophyte produces one or more gametangia that produce haploid gametes.