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Q. Show the Anatomical Evidence?
Anatomy is the study of the structure, organisation and development of cells and tissues of plants and animals. For over a century taxonomists have used comparative plant anatomy as an aid in classification. The anatomical features of stems and roots are important in separating Gymnosperms from angiosperms and monocotyledons from dicotyledons. In monocot stem the vascular bundles are scattered throughout the parenchyma, whereas in dicot stem the vascular bundles are more orderly and form a definite concentric ring. In some dicots vascular cambium will form between the bundles eventually connecting throughout and forming a solid ring of conducting tissue.
Progressive series from tracheids commonly found in the gymnosperms to specialised vessel elements occur in the secondary xylem of angiosperms. All stages of specialisation from vessels wood to highly specialised vessel elements are found in contemporary flowering plants. Angiosperms with vessels wood are regarded as primitive.
The presence and structure of trichomes as well as their distribution patterns among taxa are taxonomically important. Variation pattern of trichomes also provides characters for classification. Stornatal types are of taxonomic use. Stomata of dicotyledonous plants have kidney shaped guard cells and stomata of monocotyledonous plants have dumbell shaped guard cells.
In animals the study of anatomical parts provide enough describable characters and classification based on them lead to certain conclusions as has been shown to be true for hard parts as against skin in a test case for lower taxa among mammals. A first step is to extend anatomical data beyond those traditional forms of museum specimens in mammals to the baculeum, to the ear ossicles and then to the soft parts and the second step is to push anatomical observation to deeper levels to cytology and especially karyology.
HYPOTHALAMUS - Hypothalamus develops from the ectoderm of the embryo. Location and Structure. It lies below or inferior to the thalamus. The hypothalamus is connected to t
plz give the classificational chart of animals upto speceis level
Molecular Hydrogen N 2 -fixing organisms also produce a membrane bound enzyme called uptake-hydrogenase under N 2 -fixing condition. The physiological significance of the pres
Dysrhythmias Usually occur during the initial 24-72 hours, but may occur later on also. The causes may be ventricular irritability due to manipulations of heart durin
Functions of Testis The testis performs the following two functions: Proliferation of spermatozoa and Secretion of steroid hormones
Q. What is Digital periapical radiography? Digital radiographs can be subjected to image processing with which the images can be altered to achieve task specific image characte
economic importance of tubularia
example of pisces
REGUL A TIV E THEORY It was propounded by Hens Driesch. He performed experiments on the eggs of sea urchin similar to the experiments performed by Roux. He observed
Potassium, Calcium, Iron and Magnesium - Microorganism? These are supplied by inorganic salts and exist in the cell as cations. These perform various functions in the cell like
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