Environmental Studies · Biology

Soil Science and Fertilizers

1,537 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 geography agriculture in india - i : introduction agricultural policy in india indian agriculture problem and policies problems of indian agriculture

Leguminous crop enriches the soil with _______________.

  1. Phosphorus

  2. Nitrogen

  3. Potassium

  4. Water

  5. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  1. Leguminous plants contain symbiotic bacteria called Rhizobia within nodules in their root system, producing nitrogen compounds that help the plant to grow and compete with other plants.
  2.  This bacteria absorbs molecular nitrogen from the atmosphere and converts it into inorganic nitrogenous compounds which is used for organic nitrogenous compounds synthesis.
  3. When the plant dies, the fixed nitrogen is released, making it available to other plants and this helps to fertilize the soil.
Multiple choice botany mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements nutrients and nutrition

Hydroponics is growing plants

  1. Without soil

  2. Without organic matter

  3. In water

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

Culturing of plants in soil less medium is called hydroponics. Plants are raised in small tanks filled with a solution containing appropriate quantities of all mineral elements. The solution is changed from time to time. It has a mechanism for aeration and circulation. Iron is added as Fe-EDTA otherwise it gets precipitated. EDTA is a chelating agent which keeps the metal ion in the soluble state. There is no need of organic matter. Hydroponics is useful in areas having thin, infertile and dry soils. Through this technique out of season fruits and vegetables can also be grown. 

Thus the correct option is D.

Multiple choice botany mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements nutrients and nutrition

Hydroponics is growing of plants 

  1. Without soil.

  2. Without organic matter.

  3. In water.

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

Hydroponics is part of hydroculture and within this, the plant is growing in a soilless medium or in an aquatic-based environment, it uses only the mineral nutrient solution to feed the plants.

So, the correct answer is option D.

Multiple choice botany mineral nutrition in plants hydroponics hydroculture essential and non-essential mineral elements nutrients and nutrition

Mineral requirement is studied through hydroponics which is related to growing plants in

  1. Soil

  2. Air

  3. Solution

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

Solution culture is being used for raising flowers and vegetables. This soil- less production of plants is called hydroponics. Plants are raised in small tanks. They are filled up with solution containing appropriate quantities of all mineral elements. The solution is changed from time to time.

So , the correct answer is option C.

Multiple choice soil as a natural resource natural resources - air, water and land land physical resources biology

Out of the total cost of various ecosystem services, the soil formation accounts for about:-

  1. $50\%$
  2. $10\%$
  3. $6\%$
  4. $71\%$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Out of the aggregate expense of different ecosystem services, the dirt arrangement represents around 50 percent and commitments of different administrations like the diversion.

So, the correct option is '50%'.

Multiple choice soil as a natural resource natural resources - air, water and land land physical resources biology

What is best pH of soil for cultivation?

  1. 3.4 - 5.4

  2. 4.5 - 5.5

  3. 5.5 - 6.5

  4. 6.5 - 7.5
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Soil nature is described in pH values. It can be alkaline, acidic or neutral. 
  • Highly acidic and highly saline soil often remains injurious for plant growth, microorganisms, etc. 
  • Soil pH strongly affects microbial activities. Neutral or slightly acidic soil (5.5-6.5) remains best for the growth of the majority of plants.

Therefore, the correct answer is option C.

Multiple choice biology wastewater story sewage treatment wastewater treatment - need and methods conservation

Sheela's teacher said in her classroom that we should not dispose of motor oils and medicines in the drain. Why did her teacher say this statement?

  1. Motor oil and medicine allows the bacteria to grow.

  2. Motor oil and medicine hamper the degradation process.

  3. Motor oil and medicine blocks the soil pores.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Sheela's teacher said in her classroom that we should not dispose of motor oils and medicines in the drain because Motor oil and medicine hamper(prevent) the degradation process.
  • Chemicals present in motor oil and medicine kill the microbes that facilitate degradation process.so do not throw them down the drain.
  • So, the correct answer is 'Motor oil and medicine hamper(prevent) the degradation process.'.
Multiple choice botany plant breeding plant breeding for disease resistance and insect resistance method of plant breeding for crop improvement plant breeding for food production

Which of the following statements is not correct about fertilizer?

  1. It enriches the soil with organic material

  2. It provides nutrients to the soil immediately in concentrated from

  3. It increases the crop production several times

  4. It is available in all seasons
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Manure enriches the soil with organic material (humus). A fertiliser does not provide any Humus to soil.

Multiple choice botany biotechnology and genetic engineering use of microbes in biotechnology use of microbes in industrial applications useful microorganisms

In a microbiology laboratory, the technician uses heat to sterilise the nutrient solution that is used to grow 4. a fungus. When the heating system broke down, he sterilised the solution by passing It on a sterile environment) through a sterile filter with a pore size of 0.2 micrometers. When the fungus was grown on the filtered nutrient solution, it stopped growing and looked unhealthy within a few days. Which statements is the most likely explanation for the observed effects on the fungus ?

  1. The nutrient solution contained a virus

  2. Heating makes the glucose in the nutrient solution more digestible

  3. Filtering removed one of the larger nutrients

  4. The nutrient solution contained a bacterium that was pathogenic to the fungus.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A) Viruses inhibit the growth of other organisms by entering the host organism and using its genetic material and nutrition to reproduce. Hence, the fungus stops growing.

B) The fungus absorbs glucose. Heating glucose will destroy it and the fungus will not be able to digest it.
C)  Glucose is a micro-molecule which passes through the filter. The fungus mainly requires glucose to survive. Filtering did not affect the fungus.
D) Bacteria are too large to penetrate the filter and hence cannot affect the fungus.
So the correct answer is 'The nutrient solution contained a virus'.

Multiple choice evs - i agricultural development in india social and economic change food storage and conservation of environment independent india (the first 30 years - 1947-77)

What are the ecological effects of green revolution ?

  1. More irrigation increased the alkalinity & salinity of the soil decreased underground water level

  2. The increase in irrigation created need for dams to harness water

  3. More use of chemical fertilizers made the soil barren and poisonous

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

Green revolution has negative as well as positive effects. Some of the negative effects can be stated as follows - 
a) increase in irrigation created need for more dams to harness water
b) more chemical fertilizers made the soil barren and poisonous
c) many traditional variety of crops which are environment friendly and had disease resistance capacity became extinct
d) more irrigation increased the alkalinity and salinity of the soil and also it depletes the underground water level.