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 evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

Fertilizers are materials which supply only nitrogen to the soil.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Fertilizers are materials which supply essential elements to the plants through soil.

They are of various types like
$\bullet$ NPK Fertilizer
$\bullet$ Comound fertilizers, etc.
They can supply Nitrogn, Phosphorous, Potassium to the soil.

Multiple choice evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

An example for nitrogenous fertilizer is _________.

  1. super phosphate

  2. urea

  3. potassium sulphate

  4. potassium chloride
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Examples of nitrogenous fertilizers:-

1) Nitrate fertilizers
2) Ammonium fertilizers
3) Nitrate and ammonium fertilizers
4) Amide fertilizers
   (i)Urea- It is slightly acidic in nature. Urea application to soil creates a small loss of calcium from the soil. Urea is highly concentrated nitrogenous fertilizer containing 46% nitrogen.
   (ii)Calcium Cyanamide- It is non-leachable, synthetic organic fertilizer. Its basicity (alkalinity) is three times as high as that of sodium nitrate and advisable for use on acid soils.

Multiple choice evs - i food for all improved methods of agriculture receding water table water conservation and irrigation

Excess use of nitrogen fertilizers does not lead to:

  1. pest problems

  2. growth problems

  3. fruiting problems

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

1) Nitrogen fertilizers does not lead to pest problem but it leads to other bad causes to environment.

2) Excess nitrogen in the air can impair our ability to breathe, limit visibility and alter plant growth.  

3) Nutrient pollution is one of America's most widespread, costly and challenging environmental problems, and is caused by excess nitrogen and phosphorus in the air and water.

Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Which of the following statements is not correct regarding mycorrhiza ?

  1. It helps In absorption of phosphorus from the soil.

  2. It is a symbiotic association of fungi with the roots of higher plants.

  3. It helps the plant in developing resistance to root-borne pathogens.

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Mycorrhizae helps In absorption of phosphorus from the soil, it is a symbiotic association of fungi with the roots of higher plants, it helps the plant in developing resistance to root-borne pathogens.
So, the correct option is 'None of these'
Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Mycorrhiza does not help the host plant in:

  1. enhancing its phosphorus uptake capacity

  2. increasing its tolerance to drought

  3. enhancing its resistance to root pathogens

  4. increasing its resistance to Insects.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Mycorrhiza helps the host plant in enhancing its phosphorus uptake capacity, in increasing its tolerance to drought. Mycorrhiza produces some chemicals which resist the pathogen like Fusarium.
So, the correct option is 'increasing its resistance to insects'
Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Mycorrhiza promotes plant growth by

  1. Absorbing inorganic ions from soil

  2. Serving as plant growth regulator

  3. Protecting plant from infection

  4. Helping plant in using atmospheric nitrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizae primarily enhance plant growth by increasing the surface area for the absorption of inorganic ions, particularly phosphorus, from the soil.

Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Plants growing in oligotrophic forest soils usually have

  1. Mycorrhiza

  2. Slow growth

  3. Reduced growth

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

Oligotrophic soils are nutrient-poor. Mycorrhizal associations help plants survive in these conditions by significantly increasing the surface area for nutrient absorption, particularly phosphorus.

Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Mycorrhiza is helpful in

  1. Synthesis of food

  2. Getting nutrients from soil

  3. Providing resistance against different regulators

  4. Increase the fertility of soil
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Mycorrhizae are primarily mutualistic associations that enhance the plant's ability to absorb water and mineral nutrients, such as phosphorus and nitrogen, from the soil.

Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Mycorrhiza improve the soil structure by _______________.

  1. Secreting carbonic acids

  2. Releasing glycosides

  3. Absorbing heavy metals

  4. Adding amino acids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizal fungi contribute to soil structure by secreting organic acids, such as carbonic acid, which help weather minerals and release nutrients, while also producing glomalin that helps aggregate soil particles.

Multiple choice botany living world mycorrhiza classification of fungi kingdom monera, protista and fungi useful and harmful microbes

Roots of higher plants develop mycorrhiza for obtaining

  1. Sulphates

  2. Nitrogen

  3. Phosphates

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

Mycorrhiza is a type of symbiotic relationship. It is seen when two organisms have mutually beneficial relationship with each other. In this cas, the roots of plants host fungi, which helps them obtain water, sulphur, phosphates from soil. They also help them fix nitrogen. Inturn, fungi obtain nutrition and shelter 

So, option D is the correct answer.