Question

The chemical responsible for killing of weeds is known as? also mention what effects it causes on the ecology of that particular place.

Answer 1

Hint: Weeds generally refers to those unnecessary plants that grow among crops. They compete with these crops for nutrients, water etc. Weedicides are meant for killing these weeds. Weeds must be controlled to increase the yield of crops. It ensures higher efficiency of irrigation methods, fertilizers and other methods that ensure better quality and yield of crops.

Complete answer:
-Weeds are simply defined as a plant which grows where it is unwanted.
-These are not intentionally sown but external conditions favour their growth.
-They grow quickly ,can be toxic ,and reduce crop growth.
-Weedicides are highly useful as they play an important role in controlling weeds. They do not show any negative impact on crop plants.
-Effects of weedicides on ecology is very high. They have a negative impact on frogs and bird populations.
-Weedicides are nothing but chemicals, so their long term exposure can lead to cancer as well.
-Excessive use can lead to change in pH of soil. It can lead to acidification of soil or can even make it alkaline.
-They can destroy useful microorganisms in soil leading to reduction in soil fertility. They can also cause rashes and skin allergies.

Additional information:
-Butachlor, Anilophos ,Isoproturon are some of the commonly used weedicides.
-Farmers cover their mouth and nose during spraying of weedicides. Special sprayers are used for this purpose.
-They are sprayed 32-40 days after sowing.
-Before weedicides, physical methods were employed to remove weeds. It took a lot of effort and required more time.
-2,4-D or 2,4-dichlorophenoxy acetic acid is a dicot weedicide. It is a cheap weedicide.

Note:
Weedicides are highly used in agriculture. Their persistent use can lead to soil and water contamination and other harmful effects on nontarget organisms. Herbicide degradation can result in the formation of new compounds which are toxic.