In this article we will discuss about the external features of marsilea. 1. Plant body (Fig. 258) is sporophytic and the sporophyte possesses a rhizome; having man) roots arising towards lower side and leaves towards the upper side. 2. Rhizome is long, slender, well-branched and grows on or below the soil surface and may attain a length of several metres [...]
Observe the external features of the plant, and arrangement, types and shape of leaf, ligule, rhizophore and roots. 1. Plant body is sporophytic and the sporophyte is evergreen and perennial. 2. Most of the species are prostrate but Selaginella trachyphylla is sub-erect and S.erythropus is erect (Fig. 208). 3. Size of the sporophyte ranges from few centimetres to several feet [...]
In this article we will discuss about the parts of electron microscope with its construction. 1. The electron microscope is an instrument which utilizes the short wavelength of an electron beam, rather than light waves, to obtain very high magnification and resolution of minute structures for which a light microscope is inadequate. It contains an electric gun whose beam is [...]