Part 5 B Variations in Plants - Gymnosperm

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Description
Gymnosperm is a group of Spermatophyte Seed-Bearing Plants with Ovules on Scales which are usually Arranged in Cone-like structures.In this Presentation you will learn about the Features of Gymnosperms and their Economic Value.

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Presentation Transcript

Slide 1 : Pinus is exceptional as it exhibits cleavage as well as simple polyembryony

Slide 2 : Ovule of Cycas Micropyle Pollenchamber Archegonial chamber Achegonium Female gametophyte or endosperm Inner fleshy Sarcotesta Middle hard Sclerotesta Outer thin sacrocotesta

Diversity of Gymnosperms : Diversity of Gymnosperms Cycas and Ginkgo are considered living fossils Conifers are dominant groups presently Gnetales are advanced gymnosperms as they share many features with angiosperms Presence of flowers Vessels in xylem Double fertilization in Gnetum

Slide 4 : Cycas circinalis is the plant with largest gametes and which are visible with naked eyes. It is only gymnosperm where female cones are absent

Slide 5 : Pinus excelsa resin, Fossil resin amber Used as ornamental stones Called fossil resin as it is showing insects embedded

Slide 6 : Cedrus yields deeply scented wood Anti- insect and therefore, costly

Slide 7 : Ephedra which yields Ephedrine drug Ephedra male