In
biology, a
spore is a unit of
asexual reproduction that may be adapted for
dispersal and for survival, often for extended periods of time, in unfavorable conditions. By contrast,
gametes are units of
sexual reproduction. Spores form part of the
life cycles of many
plants,
algae,
fungi and
protozoa.
Bacterial spores are not part of a sexual cycle but are resistant structures used for survival under unfavourable conditions.
Myxozoan spores release amoebulae into their hosts for parasitic infection, but also reproduce within the hosts through the pairing of two nuclei within the plasmodium, which develops from the amoebula.