Kingdom Fungi
Kingdom Fungi:
i) They are heterotrophic.
ii) They are cosmopolitan and prefer to grow in warm and humid places.
iii)They are multicellular except yeast which is unicellular.
iv) They are eukaryotic .
v) Fungi are filamentous with long, slender thread called Hyphae and the network of hyphae is known as Mycelium ·Some hyphae are continous tubes filled with multinucleated cytoplasm and are known as coenocytic hyphae.
vi) Cell wall is chitin. The cell walls of fungi are composed of chitin and polysaccharides.
vii) They are saprophytes/parasites/ symbionts·Symbionts of algae and fungi (Lichens) and Pine trees roots and fungi (Mycorrhizae) on roots to absorb water.
viii) Reproduction by fragmentation, fission, budding. Asexual reproduction is by spore called conidia or sporangiospores or zoospores, and sexual reproduction is by oospores, ascospores and basidiospores.
Sexual Reproduction steps.
-
Fusion of protoplasms between two motile or non-motile gametes
called plasmogamy. - Fusion of two nuclei called karyogamy.
- Meiosis in zygote resulting in haploid spores.
In some fungi (ascomycetes and basidiomycetes), during sexual reproduction, an intervening dikaryotic stage (n + n, i.e., two nuclei per cell) occurs; such a condition is called a dikaryon and the phase is called dikaryophase of fungus.