Information about Biology

 MORPHOLOGY:   The adult of common species of cockroach, Periplaneta Americana are about 34-53 mm long with wings that extend beyond the tip of the abdomen in males. The body of the cockroach is segmented and divisible into three distinct regions - head, thorax and abdomen. The entire body is covered by a hard chitinous exoskeleton (which is brown in colour). In each segment, exoskeleton has hardened plates called sclerites (tergites dorsally and sternites ventrally) that are joined to each other by a thin and flexible articular membrane (arthrodial membrane).  EXTERNAL FEATURES OF COCKROACH Head is a triangular shape and lies anteriorly at right angles to the longitudinal body axis. It is formed by the fusion of six segments and show great mobility in all directions due to flexible neck. The head capsule bears a pair of compound eyes. A pair of thread like antennae arise from membranous socket lying in front of eyes. Antennae have sensory receptors that helps in monitori...

                             BRAIN CENTRAL NERVOUS SYSTEM (CNS):  Central nervous system includes brain and spinal cord. It coordinates all neural functions. Lets us study about BRAIN- BRAIN:                     Proportionate to the body size, shrews (tiny rat) have the highest brain to body mass ratio.The brain is present in the hard bony box like structure called CRANIUM. It is covered by three layers called the meninges. The meninges are continuous and cover the spinal cord as well. The space between the inner layers is filled with fluid called CEREBRO-SPINAL FLUID. It serves as a shock-absorbing medium and protects the brain against shocks/jerks along with meninges and cranium. Mainly the nerve cell bodies together with capillaries form a mass called GREY MATTER, while the myelinated axons or those covered by fatty sheaths form white matter. The grey matt...

                            Dr. RONALD ROSS        DISCOVERY OF MALARIA PARASITE IN FEMALE ANOPHELES BY                                                        Dr. RONALD ROSS           Dr. Ronald Ross was a military doctor, who did his research extensively on malaria for 16 years (1881-1897) in INDIA. He finally discovered Malaria causative microbes in female anopheles mosquito which fed on malaria infected patient. He found the route map of malaria disease, for that he got NOBLE PRIZE IN 1902.