Farmers use insecticides to kill insects that damage crops. these also kill dragonflies. How can killing dragonflies be harmful to us
Answers
Explanation:
Insects are responsible for two major kinds of damage to growing crops. First is direct injury done to the plant by the feeding insect, which eats leaves or burrows in stems, fruit, or roots. There are hundreds of pest species of this type, both in larvae and adults, among orthopterans, homopterans, heteropterans, coleopterans, lepidopterans, and dipterans. The second type is indirect damage in which the insect itself does little or no harm but transmits a bacterial, viral, or fungal infection into a crop. Examples include the viral diseases of sugar beets and potatoes, carried from plant to plant by aphids
Explanation:
The adult dragonfly has huge compound eyes that are useful in searching for flying insects. While flying it uses its six legs to scoop food out of the air. Clasping the prey in its front legs, it then eats the insect in flight. Dragonflies play ecological roles not only as predators but also as prey of birds, frogs and other creatures.
The adult dragonfly has huge compound eyes that are useful in searching for flying insects. While flying it uses its six legs to scoop food out of the air. Clasping the prey in its front legs, it then eats the insect in flight. Dragonflies play ecological roles not only as predators but also as prey of birds, frogs and other creatures.Researchers also look to dragonflies as ecological indicators. The presence of dragonflies indicates fresh water. One of the most useful dragonfly facts is that they reside low in the food chain, so scientific study of their numbers and their health can reveal changes in water ecosystems more quickly than studying other animals or plants. Some national parks are beginning to use this species to survey and document the health of the park's water ecosystems.
