Answer:
The spores refer to the single-celled reproductive units of the lower or nonflowering plants such as bacteria, fungi et cetera.
They are similar to the pollen of higher plants.
They are produced as a result of sexual as well as asexual reproduction.
During sexual reproduction, haploid spores are produced by the process of meiosis.
In contrast, during asexual reproduction spores are produced through mitotic division.