Cockroach bears several types of receptor organs likes other insects to perceive different types stimuli like touch, smell, taste, sound, change in temperature and light. From these all, except the receptors for light—the photoreceptors, i.e., eyes, are found situated in the epidermis of the integument and in fact they are modified epidermal cells called sensillae. Sensillae: A sensilla is the [...]
In this article we will discuss about the central, peripheral and sympathetic nervous system of cockroach. Central Nervous System of Cockroach: The central nervous system consists of the supra-oesophageal ganglion or brain, sub- oesophageal ganglion and the nerve cord. The supra-oesophageal ganglion or cerebral ganglion is a bilobed structure situated in the head in front of oesophagus, above the tentorium [...]
The following points highlight the six major diseases caused by mosquitoes in man. The diseases are: 1. Malaria 2. Yellow Fever 3. Dengue Fever 4. Filariasis or Elephantiasis 5. Encephalitis 6. Dermatobia. Disease # 1. Malaria: Malaria is a deadly human disease. It is-transmitted by Anopheles', malaria is caused by a parasitic protozoan Plasmodium which spends part of its life [...]