Answer:
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.
