The Gymnosperm

The Gymnosperm

by Partha Pratim GoswamiNo Comments
Hi viewers Today we will discuss about the Gymnosperm. Basically, Gymnosperms are eukaryotic plants, which have naked seed and fertilization takes place after one year of fertilization. PROPERTIES GYMNOSPERM They are eukaryotic in nature They are autotrophic Roots,stem and leaf are distinct Woody stem and xylem are present Naked seeds are present Spiny leaves are present Fertilisation takes place after one year of pollination Male cone and female cone are present They are evergreen and perennial Eg. Pinus and Cycas, etc. 1.  Name one gymnosperm where xylem vessels and companion cells are present. (1) Ans. Gnetum 2.  Differentiate between bract scale and ovuliferous scale. (2) Bract scale Ovuliferous scale 1. They are located at the base of the microsporophyll. 2. They have a membranous structure. 3. They protect the base of the megasporophyll and provide their attachment with the axis. 1. They are the upper lateral projections of the megasporophyll. 2. They have a more woody structure. 3. They provide support and protection to the ovules. Differentiate between endosperm of gymnosperm and endosperm of...
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The Pterydophyta

The Pterydophyta

by Partha Pratim GoswamiNo Comments
Hi viewers Today we will discuss about the world of Pterydophyta Definition of Pterydophyta Pteridophytes are vascular plants that reproduce and disperse via spores, these plants produce neither flowers nor seeds and it also show alternation of generation. PROPERTIES PTERYDOPHYTA Autophytic nutrition. Terrestrial Body is divisible into root, stem and leaf They are nonflowering plants Reserve food material is starch Cell wall- cellulose Sporophytes and Gametophytes are separate plants Adult life starts with sprophyte Chemotropism- occurs by synthesis of malic acid Vascular tissue is present Eg. Any kind of fern 1.  What are the main characters of Pteridophytes? (3) Ans. The main characters of Pteridophytes are in the following: a) Pteridophytic plants are advanced than the bryophytes but less advanced than gymnosperms, and mostly they are terrestrial. b) They are non-flowering plants, and do not bear flowers, fruits and seeds. c) The leaves are generally of two types- small and scale like microphyllous and large megaphyllous. d) The plant body is the sporophyte, which is well developed, autotrophic and long lived....
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