Role of Chemical Fertilizers in Soil Management

Q. How do leguminous plants help in maintaining soil fertility?

Q. Urea is an example of organic fertilizer.

1. True
2. False

Q. Chemical fertilizers causes air pollution.

1. True
2. False

Q. is an example of an organic fertilizer.

1. Vermi-compost
2. Ammonium sulphate
3. Super phosphate

Q.

With respect to the following statements, choose the correct answer.
i.Food security depends on both, the availability of food and access to it.
ii.Mixed farming degrades the nutrient quality of the soil.
iii.Fertilisers are commercially produced plant nutrients.

1. Only statement (ii) is correct
2. Statement (i) and (ii) are correct
3. Only statement (ii) is incorrect
4. Only statement (iii) is correct.

Q. What are fertilizers?

Differentiate between Natural/Organic fertilizers and Chemical/Inorganic fertilizers. [3 MARKS]

Q.

The use of fertilizers has both advantages and disadvantages.

1. True

2. False

Q. What is fertilizer a type of a spray or email which comes out of a machine?

Q. Why is the use of biofertility preferred to chemical fertilizers?

Q. Urea is an eco-friendly fertilizer.

1. True
2. False

Q. What are the disadvantages in using chemical fertilizers?

Q. Continuous use of chemical fertilizers can turn the soil___.

1. rich in organic material
2. rich in humus
3. infertile
4. fertile

Q. Which plant should be grown by farmer after harvesting wheat crop ?

1. Paddy
2. Tomato
3. Leguminous
4. Maize

Q. Which plant should be grown by farmer after harvesting wheat crop ?

1. Paddy
2. Tomato
3. Leguminous
4. Maize

Q. Contains of a fertilizer

Q. Fertilizers gets washed away due to

1. Excessive irrigation
2. Not fully absorbed by the plants
3. Above A and B
4. None of the above

Q. Ram visited a lake nearby and saw many fishes dead. He questioned the security what is the reason behind it. He complained that the farmers around are using excessive fertilizers. Which among the given fertilizer can be a threat to aquatic organisms?

1. Urea and Monopotassium phosphate
2. Phosphotika and Urea
3. PGPR and NPK
4. Bacillus and Rhizobium

Q. Chemical substances which increase the fertility of the soil are known as _______.

1. manures
2. pesticides
3. weedicides
4. fertilisers

Q. State whether the following statements are true or false.​
Statement 1: Fertilisers do not cause any harm to the microorganisms in the soil.​
Statement 2: Addition of fertilisers causes water pollution.​

Q.

Differentiate between:

Fertilizer and manure

Q.

Give reasons for the following:

Manure is considered better than chemical fertilisers.

Q. NPK fertiliser supplies nitrogen, phosphorus and _____ to the crops.

1. potassium
2. sodium
3. calcium
4. magnesium

Q.

Manure is rich in humus while fertilizers are rich in nutrients.

1. True

2. False

Q. Farmers use Rhizobium to fix _____ levels in the soil.

1. carbon
2. iron
3. nitrogen
4. oxygen

Q.

Excessive use of chemicals in agriculture can cause environmental pollution.

1. True

2. False

Q. Bacillus bacteria are used to increase the quantity of ___ in the soil.

1. phosphorus
2. potassium
3. carbon
4. nitrogen