Two biology questions

In which part of meiosis does the chromosome number reduce?

Describe the haploid life cycle.

The chromosome reduction from 2n n (assuming diploid) occurs in meiosis I. Meiosis II is basically just meitosis but it copies gametes instead of somatic cells.

For the life cycle I would just say:

1) The haploid cell is produced as a result of meiosis I and II.
2) The haploid cell joins with another haploid cell (i.e sperm and egg) to form a diploid cell.
3) diploid cell becomes zygote
4) zygote grows up
5) circle of life

The chromosome number is reduced during meiosis I, which is the reductional phase. Somatic cells (all cells excluding the sex cells ) have a diploid number of chromosomes. Human somatic cells, for instance, all contain a diploid number of 46. Meiosis is a form of cell division that generates the gametes (sperm and ova). It reduces the chromosome number from diploid (2n) to haploid (n). Therefore, gametes contain half the number of chromosomes (in humans, this haploid number is 23). Meiosis occurs so that, during fertilization (the union of a sperm and ova), the diploid condition will be restored in the zygote. Just imagine, if meiosis did not occur, the diploid number would continue to double. Therefore, meiosis is essential to all sexually reproducing organisms.