Many organisms spend most of their life cycle in the diploid state. If meiosis produces haploid cells, how is the diploid number restored for these types of organisms?

The correct answer to the following question is "By fertilization".

Explanation:

Fertilization seems to be the mechanism or process whereby genders (Females or males) gametes are mixed simultaneously, causing a fresh organism to create.

Several species invest the bulk of their development process in a diploid form. If genetic recombination or meiosis creates haploid organisms, the number of diploids preserved by fertilization for certain kinds of species.