Some insects that eat plants have receptor cells for a taste that is good in absorbing certain host chemicals. For example, glucosinolate is a compound found in the cabbage family and some vegetables of cruciferouracae have cells glucosinolate sensitive cells and are often most sensitive to certain glucosinolates found in normal hosts. The butterfly adults and adults of some herbivorous flies have similar receptor cells in the upper body, making it easier to identify a host plant for laying eggs. Some insects also have taste hair receptor cells that can find out pheromones on the surfaces of other insects. Perception of these chemicals is not related to the food and thus this indicates contact chemistry rather than taste.
Receptors for Smell:
In arthropods, olfactory receptors are mainly located in the tactile structures at the anterior end of the animal. In crustaceans, antennules contain nearly all of the porous hair, while insects are on the antennae. In arachnids, porous hairs are found in different groups in different places. The scorpion’s olfactory receptors are located in a structure called pectines, which protrudes from the ventral surface of the second part of the opisthosoma, However, the whip scorpion and spider have an antenna-like structure which is modified first pair wing. Some spiders can smell, but no receptors have been found. The complexity and length of the antennae in insects reflect the amount of sensitivity of the multi-pore sensilla. In insects that require higher sensitivity, the antennae will be spilt, providing more surface area for more sensation. The male moths have a large surface area compared to female moths as the former have a feather-like antenna while the latter has a thin slender antenna. The olfactory receptor cells axon travel to the CNS, where all cell axons with the same sensory properties form glomeruli by converging similar to those found in vertebrates. In insects, each olfactory receptor cell seems to express only a single protein receptor-like that of vertebrates. Consequently, each cell reacts to a specific chemical.
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