Biological Classification

New systematics is also called as biosystematics is concept of systematics which brings out taxonomic affinities on the basis of evolutionary, genetic and morphologicaltraits.New systematics deals with cladistics or phylogenetic classification.

Nostoc is a moneran and other four are protists. But among the four given protists only slime moulds are saprophytic. Slime moulds or fungus animals are found in damp places and may be acellular or cellular ones.

Ascomycetes include pigmented moulds, powdery mildews, yeasts, cup fungi, morels and truffles. They have septate hyphae with cell wall containing chitin or fungal cellulose. Nutritionally they are saprophytic, decomposers, parasitic or coprophilous. Asexual reproduction occurs by budding, fission, oidia stage and through exogenously produced conidia. Sexual reproduction takes place by gametic fusion, gametangial contact and autogamy. Ascus (sac) a sporangial sac peculiar to Ascomycetes is formed and hence the group is also called sac fungi.