Zoology

CHORDATES   The Phylum Chordate includes bilaterally symmetrical, metamerically segmented, triploblastic, enterocoelomate metazoans exhibiting hights…
The animal kingdom is divided into two sub-kingdoms:   Chordata Non-Chordata   GENERAL CHARACTRS OF…
THEORIES ABOUT ORIGIN OF CHORDATES   It is believed that Chordates have originated from invertebrates.…
In Eutherian mammals the embryo develops in the uterus of mother. The developing embryo will…
There is an interrelation between the form of teeth arid nature of food. These may…
The tooth develops partly from the epidermis and partly from the mesenchyme of dermis. Its…
Two main theories have been proposed to explain the evolution of molars.   CONCRESCENCE THEORY…
Teeth are the dermal derivatives of integument They are developed as a result of calcification
The mammalian teeth are placed in the muscular sockets in the jaw bones. This type…
Mostly the number of teeth is fixed in each mammalian species. Mammalian heterodont dentition is…
SKIN STRUCTURE AND FUNCTIONS IN MAMMALS The body of Rabbit is covered by skin. It…
In the mid ventral region of thorax of Rabbit sternum is present. It is made…
The internal ear of rabbit includes "organ of corti" or Cochlea spirally coiled. Lagena is…
THERIA   This group includes Mammals which show true mammals characters Infraclass Metatheria:   They…
Mammalia is divided into two subclasses. 1) Prototheria 2) Theria   GENERAL CHARECTERS OF PROTHERIA…
Mammal like Reptiles therapsida might have given Mammals. It occured at the end of Triassic…
In the eye of the bird a comb like structure is present. It is called…