Herbicides, Fungicides

Q.

The chemicals used to destroy weeds are known as weedicides.

1. True

2. False

Q.

Name any two pesticides.

Q.

Chemicals that kill weeds are known as weedicides.

1. False

2. True

Q.

2, 4-D, and MCPA both are example of weedicides.

1. True

2. False

Q.

Chemicals that kill weeds are known as herbicides.

1. True
2. False

Q. Why weeds can't be protected by weedicides?
if it is weedicides, but in byjus app if we press weedicides it's coming wrong . Why is that so?

Q. Regarding the assertion and reason, choose the right option.
Assertion [A]: Green Revolution caused certain toxic effects to the environment.
Reason [R]: High inputs of fertilisers and pesticides are very harmful to the environment.

1. A is true and R is false
2. Both A and R are true and R explains A
3. Both A and R are true R does not explain A
4. Both A and R are false

Q. Chemicals used to kill the weeds are .

1. weedicides
2. insecticides
3. fungicides

Q.

Chemicals that kill weeds are known as herbicides.

1. True
2. False

Q. Excessive use of chemicals such as insecticides and pesticides causes a threat to Ecology.Explain with reason.

Q. Which of these is a major drawback of the pesticide DDT?

1. Organisms at once develop resistance to it
2. It is significantly less effective than other pesticides
3. It is not easily and rapidly degraded in nature
4. It’s cost of production is high

Q. A leguminous plant grown in an autoclaved, sterilized soil fails to produce root nodules because

1. Plants cannot form root hairs in such a soil
2. Autoclaved soil is not good for root growth
3. Autoclaving reduces $N_2$ content of soil
4. Autoclaved soil is devoid of bacteria