Fertilizers and Pesticides

Q. Identify the basic needs of humans.

1. Food
2. Shelter
3. Water
4. Clothing

Q. are the chemicals which are used to protect crops from the invasion of insects.

1. Manure
2. Chemical fertilizers
3. Insecticides

Q. Which of the following is used to preserve food grains at home?

1. Neem leaves
2. Spinach leaves
3. Curry leaves
4. Tulsi leaves

Q. Chemical fertilizers are used to get high crop yield.

1. True
2. False

Q. Organic farming is important because ____________.

1. it is less harmful to environment.
2. it adds nutrients to the soil.
3. it is made up of harmful chemicals.
4. it involves the use of manures.

Q.

Write two methods by which insects can damage a crop.

Q. are the substances which provide nutrients for healthy plant growth.

1. Fertilizers
2. Insecticides
3. Crop yields

Q. How are fertilisers different from manures?

1. They add nutrients to the soil.
2. They protect crops from pests.
3. They cause soil pollution.
4. They increase the crop production.

Q. How are fertilisers different from manures?

1. They add nutrients to the soil.
2. They protect crops from pests.
3. They cause soil pollution.
4. They increase the crop production.

Q. Pests can damage the crops in the fields.

1. True
2. False

Q.

Define pesticides.

Q. When did researchers find the use of mineral oil?

1. About 100 years ago
2. About 50 years ago
3. About 150 years ago
4. About 20 years ago

Q.

The excessive usage of which of the following in the fields can cause diarrhoea?

1. 
2. 
3. 

Q. ________ are used to kill unwanted insects in fields.

1. Pesticides
2. Seeds
3. Fertilizers
4. Manures