Environmental Studies · Biology

Soil Science and Fertilizers

1,509 Questions

Soil science focuses on soil formation, classification, and fertility management using fertilizers and organic amendments. Agricultural and environmental science exams heavily feature questions on biofertilizers, mycorrhiza, and phytoremediation. Practice these questions to build a strong understanding of soil nutrient cycles.

Phytoremediation techniquesOrganic soil amendmentsBiofertilizers and mycorrhizaNitrous oxide emissionsIn-situ soil remediationGreen manuring effects

Soil Science and Fertilizers Questions

Multiple choice biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

Which of the following fertilizer is used for the increased production of coffee, corn and soybeans?

  1. Phosphatic fertilizer

  2. Nitrogenous fertilizer

  3. Potassium fertilizer

  4. Nitrogen and potassium combined fertlizer
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The increase in fertilizer consumption is a fundamental driver for increasing agricultural productivity. so, for increasing the production of coffee, corn and soyabeans nitrogen and potassium combined fertilizer is used. Nitrogen helps plants grow quickly, while also increasing the production of seed and fruit, and bettering the quality of leaf and forage crops and Potassium, assists in photosynthesis, fruit quality, the building of protein, and the reduction of disease.
So, the correct answer is option D.
Multiple choice biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

Potassium nitrate fertilizer contains .......... of nitrogen.

  1. 46%

  2. 44%

  3. 21%

  4. 13%
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Potassium nitrate is one of the common fertilizer which is used for the growth of the plants. Potassium nitrate contains about 13% of nitrogen. There is about 44% of potassium in oxide form. The addition of this fertilizer generally results in an increase in the pH. This fertilizer readily supplies nitrogen to the soil which can be taken up by the plants. 

Thus, the correct answer is option D. 

Multiple choice biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

50 kg of superphosphate adds .......... of phosphorus to the soil.

  1. 8%

  2. 10%

  3. 13%

  4. 44%
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

There are different forms of fertilizers which are used for supplying phosphorus. Superphosphate is the common synthetic form of fertilizer which is used for enriching the soil with phosphate. About 50 kg of superphosphate adds 8% of phosphorus to the soil. Triple phosphate can also be used for adding phosphate to the soil. 

Thus, the correct answer is option A. 

Multiple choice biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

Which of the following is the phosphatic fertilizer?

  1. Urea

  2. NPK

  3. Superphosphate

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Superphosphate is a phosphatic fertilizer. It is most commonly found as single super phosphate, double super phosphate and triple super phosphate. The main component of this fertilizer is phosphate. It's phosphate part get dissolved in the soil water when it is applied in the field. The dissolved phosphorus is easily taken up by the roots of growing plants. Whereas, urea is a nitrogen fertilizer and NPK is made up of nitrogen, phosphorus and potassium. So, the correct option is C. 
Multiple choice biology natural resources and agriculture manure manures and fertilisers role of organic manures in soil management

Which of the following is not of the three plant macronutrients included in most fertilizers?

  1. O

  2. N

  3. P

  4. K
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The three primary plant macronutrients are Nitrogen (N), Phosphorus (P), and Potassium (K). Oxygen (O) is obtained by plants from the air and water, not typically added as a fertilizer macronutrient.

Multiple choice chemistry planet earth acid deposition air and air pollution natural resources- air, water and land

Which of the following is/are damages caused by acid rain?

  1. It depletes the soil of nutrients, increases the acidity of the soil and reduces fertility.

  2. It destroys marine life due to change in pH of the environment.

  3. It causes material damage.

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The damages caused by acid rain are:

  1. It depletes the soil of nutrients, increases the acidity of the soil and reduces fertility, as the ideal conditions for the growth of trees are lost. 
  2. It destroys marine life due to change in pH of the environment, making it unfit for habitation by aquatic animals.
  3. It causes material damage such as corrosion of marbles. 

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Organic and mineral nutrients undergo______

  1. Unidirectional

  2. Bidirectional

  3. Multidirectianal

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Organic material in plants is transferred by phloem while water and mineral nutrients are transferred by xylem. It is a well-known fact that xylem only has unidirectional transport of water while phloem can exhibit bidirectional transport.

So, the correct answer is 'Both A and B'.

Multiple choice botany water absorption and ascent of sap in plants apoplast and symplastic pathway transport of water in plants water transport

Which substances do the plants obtain from the soil for the constitution of the body?

  1. Organic substances

  2. Inorganic substances

  3. Complex substances

  4. Insoluble substances
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Soil contains a large number of inorganic substances in the form of ions which are taken up by the plant through process called ascent of sap
So, the correct answer is 'Inorganic substances'
Multiple choice botany families of angiosperms family fabaceae eudicots family - fabaceae, sativum and solanaceae study of some important families

Plants which are used as green manure in crop fields and in sandy soil is

  1. <p> Crotalaria juncea and Alhagi camelorum</p>

  2. <p> Calotropis procera and Phyllanthus niruri</p>

  3. <p>

    </p><p> Saccharum munja and Lantana camara</p>

  4. <p> Dichanthium annulatum and Azolla nilotica</p>
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In agriculture, green manure is created by leaving uprooted or sown crop parts to grow on the field so that they improve soil properties. In green manure, quick-growing crops such as Crotolaria juncea and Alhagi camelorum which are cultivated and ploughed into the soil which increases crop yield by 30-50%. Crotolaria juncea, commonly known as Indian hemp is a tropical Asian plant belonging to family Fabaceae. Alhagi camerolum, commonly known as camelthorn belongs to family Fabaceae. So, the correct answer is 'Crotolaria juncea and Alhagi camelorum'.

Multiple choice general knowledge impact of technology on livelihoods animal husbandry and fishery cattle farming agriculture sector

With reference to micro-irrigation, which of the following statements is/are correct?
1. Fertiliser/nutrient loss can be reduced.
2. It is the only means of irrigation in dry land farming.
3. In some areas of farming, receding of ground water level can be checked.
Select the correct answer using the codes given below

  1. Only 1

  2. 2 and 3

  3. 1 and 3

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Micro-irrigation techniques like drip and sprinkler irrigation deliver water directly to the plant roots, significantly reducing fertilizer and nutrient runoff losses (statement 1 true). It also limits deep percolation and evaporation, helping to check the receding of groundwater levels in certain agricultural regions (statement 3 true). Statement 2 is false because micro-irrigation is not the exclusive means of irrigation in dry lands.