BACHELOR OF SCIENCE (HONS) Lecture : Plant Kingdom

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Kingdom plantae includes green, brown and red algae, liverworts, mosses, ferns and seed plants with or without flowers. The reproductive organs are multicellular. (7) a multicellular embryo is formed during development from the zygote. Life cycle consists of alternating haploid gametophyte and diploid sporophyte generation. Cladophora, vaucheria etc. (d) endophytes: some blue-green algae grows as endophytes inside other plants e. g. , anabaena growing inside the leaf of azolla (fern) (e) epizoic: algae growing on the bodies of animals are described as epizoic. They may be motile (chlamydomonas) or non-motile (diatoms). (ii) multicellular forms: the multi celled algae show a considerable range in their organization. (a) colonial: a colony consists of independent organisms. While the colony of volvox is motile, that of hydrodictyon is fixed. (b) planeloid: here the vegetative cells of the alga get surrounded by a mucilaginous matrix e. g. , tetraspora. (c) dendroid: here the colony appears like a microscopic tree.

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