Pesticides, Insecticides

Q.

Biocontrol refers to the biological control of ________ .

1. Crop quality
2. Pests
3. Weeds
4. Yield

Q.

Explain the methods of controlling insect pests.

Q.

Describe the various methods of controlling pests attacking stored grains.

Q.

Excessive use of chemicals in agriculture cause environmental pollution.

1. True

2. False

Q.

Discuss some effective methods in controlling the houseflies and cockroaches.

Q.

What are crop's pests ? Suggest preventive measures to control pests.

Q.

Explain the various preventive measures against insect pests.

Q.

Name two natural pesticides.

Q.

Name two natural pesticides.

Q. Chemical pesticides which destroy the pests or pathogens by forming toxic fumes include all of the following except________.

1. Aluminiumm Phosphide
2. Methyl Bromide
3. Benzene Hexachloride
4. Ethylene dichloride-carbon tetrachloride

Q.

Pesticides are the chemicals that kill.

1. (a) weeds

2. (b) mites

3. (c) insects

4. (d) all of these

Q.

Is neem a biopesticide?

Q. Mention if the following statements are true (T) or false (F)​

1.Contamination means entry of germs by insect bite T/F

Q.

Define pesticide.

Q.

Give one example of natural insecticide.

Q.

Excessive use of chemicals in agriculture can cause environmental pollution.

1. True

2. False

Q. Pesticides are the chemicals usually sprayed for killing pests on the crops. Although they kill the pests, they have few disadvantages. Choose the correct one.

1. Pesticides are poisonous.
2. Pesticides are expensive.
3. Pesticides are harmful for human consumption.
4. Pesticides cause water and soil pollution.

Q.

Is insecticide harmful to humans?

Q.

Give one word for the following : A toxic substance effective against insects.

Q. Why should preventive measures and biological control methods be preferred for protecting crops?

Q.

Why some neem leaves are kept in an iron drum containing pulses?

Q.

match the columns

Column 1	Column 2
The substance that dissolves in a solvent	solution
A homogeneous mixture of solute in a solvent	solute
organic farming	preventing water pollution
A solution in which no more solute can dissolve	water pollution
oil spills	saturated solution

Q. Which of the following is used to protect stored food from insects?

1. All of the above
2. Diatomaceous earth
3. Malathion
4. Pyrethrins

Q.

The pesticides need to be replaced because:

1. they are very costly

2. they cannot be stored for a long time

3. they are mostly toxic/poisonous and non-biodegradable

4. they cause abnormalities in the target population

Q. Chemical pesticides which destroy the pests or pathogens by forming toxic fumes include all of the following except________.

1. Ethylene dichloride-carbon tetrachloride
2. Benzene Hexachloride
3. Methyl Bromide
4. Aluminiumm Phosphide

Q. Give the name of useful insects?

Q. Nobel prize was awarded to Paul Muller on the discovery of which of the following pesticides?

1. Pyrethrum
2. Malathion
3. Parathion
4. DDT

Q.

Name one insecticide.

Q. Pesticides are the chemicals usually sprayed for killing pests on the crops. Although they kill the pests, they have few disadvantages. Choose the correct one.

1. Pesticides are poisonous.
2. Pesticides are expensive.
3. Pesticides are harmful to human consumption.
4. Pesticides cause water and soil pollution.

Q. In California, citrus orchards were badly damaged by scale insects. To control these scale insects, ladybird beetles were released into these orchards. This type of pest control is known as:

1. Chemical control
2. Beetle control
3. Biological control
4. Disease control