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Tuesday, 14 April 2009 12:01

STRUCTURE OF POLYSTOMELLA (ELPHIDIUM)

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Elphidium is a marine form. It is found creeping on Sea weeds to a depth of 300fathoms Phylum : Protozoa Class : Rhizopoda Order : Foraminifera.   Structure   Elphidium is…
Tuesday, 14 April 2009 12:13

LIFE HISTORY OF POLYSTOMELLA (ELPHIDIUM)

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Life history of Polystomella shows alternation of generations (Sexual method of reproduction will alternate with asexual method of reproduction).   Elphidium-Asexual reproduction :   In Elphidium microspheric form takes up asexual reproduction by multiple…
Monday, 27 April 2009 23:49

Neoteny

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Neoteny is the retention, by adults in a species, of traits previously seen only in juveniles (pedomorphosis/paedomorphosis), and is a subject studied in the field of developmental biology. In neoteny,…
Tuesday, 28 April 2009 20:02

Edible Fishes in Pakistan

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About one thousand species of fishes are found in marine and fresh water in Pakistan. Majority of these are edible. And very few are examined for their nematode parasites.  …
15 Main Theories of Biological Evolution of Man (with Statistics) Read this essay to learn about the 15 main Theories of Biological Evolution of Man !   1. Theory of…
The hip or pelvic girdle' is present in the posterior side of the body to which the pelvic fins or hind limbs are attached. The pelvic girdle is connected directly…
The pelvic girdle is directly attached to the vertebral column in the sacral region. The pelvic girdle consists of two similar halves which are known as ossa innominata. Each os…
The hard parts of the animal body are collectively known as skeletal system or simply skeleton. The vertebrates possess the hard parts inside the body. It is known as endo…
The Appendicular skeleton is one of the divisions of the endo skeleton. It includes the pelvic and pectoral  girdles and limb bones. The skeleton of the limb in all the…