This cycle is known as alternation of generation. The two gametes fuse to form a zygote and the zygote becomes a new sporophyte. Under favourable conditions, spores can develop into new organisms through mitosis, produce multicellular gametophytes, and eventually continue to produce gametes. The spores are usually haploid and unicellular, produced by meiosis in the sporangia of diploid sporophytes. Mythimna spores release the amoeba into the host for parasitic infection, but also reproduce in the host by pairing two nuclei in the amoeba-developed plasmodia. Bacterial spores are not part of the sexual cycle, but rather a resistant structure to survive in adverse conditions. Spores are part of the life cycle of many plants, algae, fungi, and protozoa.

Spore biology is a sexual or asexual reproductive unit that can adapt to spread and survive, usually for a prolonged period of time under adverse conditions.

Here we will learn in brief about what are spores. We will learn more about what is a bacterial spore and what is the meaning of spores. The main difference between a spore and a seed as a dispersal unit is that the spore is unicellular and is the first cell of the gametophyte, while the seed contains a developing embryo that is the next generation of the multicellular sporophyte, which is composed of the pollen tube produced by the fusion of the male gametophyte of the gametophyte contains the female gamete formed by the giant gametophyte in the ovule. Spores germinate to produce haploid gametophytes, while seeds germinate to produce diploid sporophytes. In layman's terms, the difference between 'spore' and 'gamete' is that the spore will germinate and become a spore, and the gamete must combine with another gamete to form a zygote for further development.

The term spore is derived from the ancient Greek word spora, which means seed and sow.

Spore cell stage parts