Category: BOTANY(II Year VIDEO)

In this video , Dr. Ruby Singh Parmar, Assistant Professor, Biyani girls College, Jaipur, explains about lichen Structure and their life history of lichen

In this Video, Dr. Ruby Singh ,HOD, Science, Biyani Group of Colleges explains the morphological structure of “Marchantia”. It is a bryophyte belongs to thallophyta group. In this video, structure and development of Gemma body has been discussed.
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This is a part of lecture presented by Dr. Ruby Singh Parmar, (Head Of The Department, Science), Biyani girls college. This video is about two dominant which are dominant in plants i.e. gametophytic and sporophytic. In this video I have discussed about life cycle in Bryophytes.

Vaucheria is a siphonaceous and coenocytic alga . It is aseptate but septa are formed at the time of formation of reproductive structures. The wall of the filament is thin and is made up of an outer layer of pectic substances and an inner layer of cellulosic substances. The asexual reproduction in Vaucheria occurs by means of Aplanospores, Synzoospores ,and akinetes

A Meristem is a localized region of the cell which are dividing actively. There are various theories of the shoot apical Meristem. Apical Theory: It was proposed by Nageli. A single tetrahedral apical cell is the structural and functional unit of the cell . It controls all the growth processes of the cell. It is found in algae, bryophytes and pteridophytes. Histogen Theory: It was proposed by Hanstein. There are three Histogenic layers. Dermatogen which gives rise to epidermis. Periblem is destined to form the cortex. Pleurome forms the vascular cylinder. Tunica Corpus Theory : The peripheral zone consisting of one or more layers of regularly arranged cells is called as tunica and the cells surrounded by tunica is called as corpus. Histogenic layer theory: This theory was proposed by Dermen. There are three Histogenic layers . LI , LII and LIII layers

Volvox is a coenobial and colonial alga. Volvox colonies multiply so rapidly during the rainy season that the entire pond is covered by them and appears greenish. The colonies are oval to spherical in shape , having 500 to 60, 000 cells. The cells have a typical chlamydomonad type of structure. There is a single nucleus , cup shaped chloroplast , two contractile vacuoles , an eye spot, two flagella inserted at the anterior end. Reproduction in Volvox is of two types — asexual reproduction and sexual reproduction . Asexual reproduction occurs by means of special types of cells located at the posterior end of the colony . These special cells are called as gonidia. Sexual reproduction occurs at the end of the growing season. Male sex organ is known as antheridium and the female sex organ is known as oogonium.

It is a part of lecture presented by Richa Tyagi, Asst. Professor, Department of Science, Biyani Group of colleges on behalf of Gurukpo. This lecture is about cell death and how apoptosis is different from necrosis with the help of flow chart. I explained the difference between these two.Hope you like it, for more videos visit are website http://www.gurukpo.com