guided by: m.nirmala. done by:u.sabarish. n.t.kishore kumar. b.satish kumar. v.pavan kumar. t.jaya...
TRANSCRIPT
![Page 1: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/1.jpg)
GUIDED BY: M.NIRMALA.
DONE BY:U.SABARISH.
N.T.KISHORE KUMAR.
B.SATISH KUMAR.
V.PAVAN KUMAR.
T.JAYA KUMAR.
![Page 2: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/2.jpg)
BRYOPHYTBRYOPHYTAA
The Bryophyta can be considered to be the precursors of the terrestrial plants.In this chapter you are going to study the example-polytrichum.
![Page 3: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/3.jpg)
EXTERNAL EXTERNAL STRUCTURESTRUCTURE(MORPHOLOGY)(MORPHOLOGY)The structure of the
plant body is divided into an with small leaves.The young leaves are spirally arranged in three rows at the tip of the stem.
![Page 4: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/4.jpg)
REPRODUCTIOREPRODUCTION.N.
Polytrichum undergoes vegetative and sexual reproduction.vegetative reproduction takes place by various ways by primary protonema as well as by the formation of gemmae.
![Page 5: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/5.jpg)
The male gamete is chemotacally attracted
by the mucilaginous sap at the mouth of
the archegonium. The fertilized egg forms the diploid zygote.
FERTILIZATION FERTILIZATION
![Page 6: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/6.jpg)
CONCEPTS.CONCEPTS.•After fertlisation the diploid zygote produces the sporophyte.
•Polytrichum is dioecious.
•The male sex organ is called the antheridium and the female sex organ is called the archegonium.
![Page 7: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/7.jpg)
SPOROPHYTE AND CAPSULESPOROPHYTE AND CAPSULE
The upper part elongates into a slender ‘seta’ that
bears the capsule at the tip. The central region of
the capsule is formed of elongated cells called columella.
![Page 8: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/8.jpg)
Dispersal of the spore
The peristome has 32 to 64 teeth . There is a ring of pores in between these teeth –like structures. The spores are liberated out through these pores by the action of the wind.
![Page 9: GUIDED BY: M.NIRMALA. DONE BY:U.SABARISH. N.T.KISHORE KUMAR. B.SATISH KUMAR. V.PAVAN KUMAR. T.JAYA KUMAR](https://reader035.vdocuments.site/reader035/viewer/2022062308/56649ca25503460f9496168b/html5/thumbnails/9.jpg)
On falling onto a suitable substratum the
Spores germinate into a new plant. Usually
In the life cycle of polytrichum, the sporophyte is totally dependent on the gametophyte.