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Insecticides are nerve agents that enter the spiracles and cause different molecular effects depending on where they act, summarily, killing the insect. See Klaassen and Watkin's Chapter 22. Casarett and Doull's Essentials of Toxicology. Usually the insecticide acts on enzymes such as acetylcholinesterase or on ion channels such as sodium channels
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Do insecticides kill humans?
Some insecticides are just as toxic to humans as they are to insects. Typically, it just takes a larger exposure to affect a human. However, some insecticides can be toxic even in small quantities. Insecticides such as malathion or diazinon would be harmful to humans in much smaller quantities than insecticides derived from soaps or orange peels.
What is spiracles?
Spiracles are holes that are sometimes found in an animalâ??s trachea, to help them breathe. They are found on stingrays and some insects.
How insecticides help us?
insecticides help farmers to eliminate harmful insects. Most are poisonous but some are concentrated in the food chain.
What are some animals that breathe using spiracles?
Some vertebrates eg. sharks and stingrays and some arthropods eg. the indian moon moth and the cricket.
Humans have inadvertently promoted the evolution of insects that are resistant to insecticides by?
Insects became resistant because the insecticides were used on the continuously. Most insects will die at first, but there will be some that have the right genetics to resist that insecticide. When that happens the insect will the favorable gene reproduces and creates more insects that are resistant. Humans promoted this evolution by using the same insecticide on the insects.
Do arthropods have spiracles?
The larvae form of amphibians live in water and have gills. When they grow into their adult form they develop lungs. There are three orders of amphibians, Urodela, Anura and Apoda. Some Urodela (e.g Axolotls) retain their gills as adults, other orders do not.
What are some different ways that are unintended consequences of insecticides?
poison waterways which can result in unwanted impacts on marine and freshwater creatures and to kill beneficial insects.
Do crayfish have spiracles?
No. The aquatic kind of spiracle (such as you'd find on rays and skates) could be located only on cartilaginous fish, or the most primitive of the bony fish. The loosest definition of spiracles seems to include a respiratory opening such as the blowhole in whales; lobsters do have ventral openings to the gills but these are anatomically dissimilar to those. (Also since lobsters are aquatic, they do not possess spiracles of the type you'd find on insects.)
Does surrounding color affect an insects eating habits?
only some insects are affected by the change of color
Why does pesticide kill insects even after the rain washes it off?
The residual effect of active ingredients is the reason why pesticides kill insects even after washed away by rainfall. Some insecticides have to be applied after natural or supplementary moisture since the insect killer's ingredients do not have long-lasting after- or side-effects. Other insecticides, such as Talstar, will remain effective for three months regardless of irrigation or precipitation.
How does a pupa breathe in its chrysalis?
the chrysalis is not airtight (think of it as an extremely fine net) and the pupa does not breath through lungs but through spiracles (insects, some fish and some spiders breathe through holes that are in different sizes in different places on each insect, spider and fish the spiracles lead oxygen into the trachea and tissues)
Do butterflies breathe through lungs?
All reptiles breathe through their lungs. Some marine reptiles such as turtles can hold their breath for hours, but they still breathe through their lungs.
