The correct answer is option 'C': Number of chromosomes remain the same.

Meiosis is a type of cell division that occurs in sexually reproducing organisms. It involves the division of cells to produce gametes (sperm and egg cells) with half the number of chromosomes as the parent cell. This reduction in chromosome number is important for maintaining the correct number of chromosomes in the offspring.

Let's discuss each option in detail to understand why option 'C' is not a significance of meiosis division:

a) Formation of spores and gametes:
- One of the significant outcomes of meiosis is the formation of spores and gametes. In organisms that undergo sexual reproduction, meiosis ensures the production of gametes (sperm and egg cells) with half the number of chromosomes as the parent cell.
- Spores are produced in some non-reproductive structures of plants and fungi through meiosis. These spores can then germinate and develop into new individuals.

b) New recombination of genes:
- Meiosis allows for the recombination of genes, leading to genetic variation in offspring.
- During meiosis, homologous chromosomes pair up and exchange segments of genetic material through a process called crossing over. This exchange of genetic material results in new combinations of genes, contributing to genetic diversity.

c) Number of chromosomes remains the same:
- This statement is incorrect. The main significance of meiosis is the reduction in chromosome number. In meiosis I, the chromosome number is halved when homologous chromosomes separate. In meiosis II, sister chromatids separate, resulting in the production of four haploid cells (gametes) with half the number of chromosomes as the parent cell.

d) Number of chromosomes reduced to half:
- This statement is correct. Meiosis is responsible for reducing the number of chromosomes in gametes to half of the parent cell's chromosome number.
- This reduction is crucial for sexual reproduction because when the gametes fuse during fertilization, the resulting zygote will have the correct number of chromosomes for the species.

In conclusion, the correct answer is option 'C': Number of chromosomes remains the same. Meiosis is not associated with maintaining the same number of chromosomes; instead, it reduces the number of chromosomes by half in the gametes.