What are the uses of pesticides on plants(herbicide) and their effects on the environment?

Question

I need gd info pls...thx for ur help and I don't really nid big scientific words -_-" :)

Answer 1

First of all, let's clarify the terms: when you say pesticides it refers to chemicals, either natural or artificially made, that control any form of pests infesting plants. Herbicides refer to chemicals, natural or artificially made, that control plants considered as weeds. Please note that a herbicide is one form of pesticide.

The pesticides obtained from natural origins, e.g. extracts from plants that have a pesticidal effect, usually are biodegraded and have minimum or almost no negative effect on the environment. On the other hand, artificial pesticides, e.g. those made by man, tend to have a harder time degrading into much simpler molecules hence they tend to pollute the environment in the long run.

Answer 2

these are chemical substances use to kill or repel pest and weed.these chemical mix with the air while in use or rain dawn in the soil cause harm to other animals including human.

Answer 3

It depends on the herbicide. Some are derived from soap based fatty acids and just cause the plant it contacts to loose it's moisture (desiccation) and die. They don't have any harmful or lasting environmental problems. Some kill all plants with very toxic materials that literally sterilize the soil and the whole soil life system from bacteria to worms to plants is affected. Though many of them are designed to have a short life in the environment, they dissipate and break up but still remain in part in the system. It is still a matter of great debate what happens to them in the field and how they change when in contact with other things not taken into account in the laboratory.

     Other materials are herbicidal because they overdose a plant with growth hormones; like 2,4,D and some pre-emergent materials.

     You need to be familiar with the groups;

soil sterilants

pre-emergence

post-emergence

soil fumigants

The number of actual chemicals and trade names are way too many to list, but it goes back to pesticide research that was the result in many cases of military research in chemical warfare around WW2.

Answer 4

it isbecause the insects which spoil the plants to kill them pesticides are is used