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

The largest portion of India's wastelands occurs in

  1. upland without scrub

  2. water logged and marshy land

  3. degraded pasture and grazing land

  4. wastelands created by shifting cultivation
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to land use statistics in India, the largest portion of wasteland is classified as degraded pasture and grazing land.

Multiple choice biology food production uses of animals agro-complimentary occupations improvement of crop production

The nitrogen deficiency of soil can be fulfilled by using the principle of

  1. Crop rotation

  2. Transplantation

  3. Multiple cropping

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

Crop rotation is a simple process of growing alternatively legume crops after every cycle of a commercial crop. The leguminous plant have root nodules in which nitrogen fixing bacteria resides which convert atmospheric nitrogen into usable forms by plants and hence increase the fertility of the soil.

Broadcasting is a method of throwing seeds randomly on the soil for germination. Transplantation is the process of uprooting in replanting the plants at some other place. Multiple cropping is growing two or more crops together in the same piece of land in the same season.These cannot help in curing the Nitrogen deficiency of the soil.
Thus, the correct answer is 'Crop rotation.'

Multiple choice botany plant breeding biotechnology for improved food quality plant breeding for food production

Which of the following technique can fill the deficiency of micronutrients?

  1. Biological nitrogen fixation

  2. Biofortification

  3. Bioremediation

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biofortification is the method in which the food is added or supplemented with the required nutrients. It is a process of breeding crops with higher levels of vitamins, minerals, proteins, and fat content. The micronutrients are not present in every type of food and results in the deficiency diseases. The plants can be developed to produce the micronutrients through hybridization or selective breeding. These foods can be helpful to prevent deficiency disorders. 

Thus, the correct answer is option B. 

Multiple choice need of water transport in plants biology

Plant ash indicates.

  1. Organic matter of plant

  2. Mineral salts absorbed by plants

  3. Both mineral salts and organic matter

  4. Silica absorbed by plants
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When a plant is burned, organic matter is oxidized and released as gases, leaving behind the inorganic mineral salts that were absorbed from the soil.

Multiple choice evs food for health simple test for nutrients test for nutrients protein and its function nutrients and foodstuffs

Which of the following helps in nutrient conservation?

  1. Leaching

  2. Mineralisation

  3. Nitrification

  4. Immobilisation
Reveal answer Fill a bubble to check yourself
B,C Correct answer
Explanation

A.Leaching - the loss of water-soluble plant nutrients from the soil. It does not help in nutrient conservation.

B.Mineralisation – The process of formation of minerals from the organic compounds is called mineralisation. It helps in nutrient conservation.

C.Nitrification – Formation of nitrites or nitrates from ammonia or nitrogenous compounds is called Nitrification. It also helps in nutrient conservation.

D. Immobilisation – elements, cannot be transported from one place to another place in the body is called Immobilisation and the elements are called Immobilised elements.

So, the correct option is ‘Mineralisation or Nitrification’. 

Multiple choice evs soil- our life horizons of soil soil - formation and profile soil-nature

Rate of decomposition depends upon

  1. Chemical composition of detritus

  2. Temperature

  3. Soil moisture and soil pH

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

Rate of decomposition of detritus depends upon chemical mature of detritus, temperature, soil moisture and soil pH. A soil temperature of 25oC and more hastens decomposition. A low temperature of less than 10oC reduces the rate of decomposition. Moisture is essential for decomposition. Excessive moisture also impedes decomposition probably due to anaerobiosis. Neutral and slightly alkaline soils are rich in detritivores, earthworms and decomposer microbes. Acidity decreases the number of detritivores and earthworms. Soil with a small amount of lignin/chitin/cellulose and rich in nitrogen and water-soluble substances(like sugars), decomposes rapidly.

So, the correct answer is 'All of these'.

Multiple choice urea organic compounds with functional group containing nitrogen

 Fertiliser which doesn't affect the texture of the soil is:

  1. urea

  2. ammonium sulphate

  3. ammonium phosphate

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

In general, urea will provide the most nitrogen at the lowest cost. It is easy to store and does not pose as a fire risk for long-term storage. Urea may be mixed with other fertilizers or may be applied on its own. It easily mixes up soil and doesn't affect the texture of the soil.

Multiple choice urea organic compounds with functional group containing nitrogen

Urea is a  ___________ fertilizer

  1. nitrogeneous

  2. potassium

  3. phosphotic

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

More than 90% of world industrial production of urea is destined for use as a nitrogen-release fertilizer. Urea has the highest nitrogen content of all solid nitrogenous fertilizers in common use. Therefore, it has the lowest transportation costs per unit of nitrogen nutrient.

Multiple choice urea organic compounds with functional group containing nitrogen

Biuret formation in urea is kept at minimum (< 1 %), because it is:

  1. toxic and harmful to some crops

  2. corrosive in nature

  3. helpful in the decomposition of urea

  4. explosive in nature
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Biuret is a chemical compound with the chemical formula ${ C } _{ 2 }{ H } _{ 5 }{ N } _{ 3 }{ O } _{ 2 }$. It is also known as carbamylurea. It is the result of condensation of two molecules of urea and is an impurity in urea-based fertilizers.

The most common impurity of synthetic urea is biuret, which impairs plant growth. Biuret is undesirable in fertilizer urea because it is toxic to crop plants, although to what extent depends on the nature of the crop and the method of application of the urea.

Multiple choice urea organic compounds with functional group containing nitrogen

Which of the following fertilisers is used as a cattle feed?

  1. Superphosphate

  2. Calcium ammonium nitrate

  3. Urea

  4. Ammonium sulphate
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When soybean meal and other plant proteins are high in price, more urea is used to replace plant protein in the ration of beef cattle and sheep. Urea is a non-protein nitrogen (NPN) compound.