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

Compost is classified under

  1. manures

  2. fertilizers

  3. pesticides

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

Compost is an organic material produced by the decomposition of plant and animal waste, which classifies it as a natural manure rather than a synthetic fertilizer.

Multiple choice

Which of the following statements is incorrect regarding fertilizers?

  1. Fertilizers are the inorganic salts prepared in factories.

  2. Excessive use of fertilizers makes the soil less fertile.

  3. Fertilizers have become a source of water pollution.

  4. Fertilizers provide a lot of humus to soil.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fertilizers are inorganic chemical substances that provide specific nutrients like nitrogen, phosphorus, and potassium. They do not provide humus, which is organic matter derived from decaying plant and animal material.

Multiple choice

Which of the following is true about fertilisers?

  1. Fertilisers are organic matter

  2. Fertilisers are harmful if used in excess

  3. These are formed by decomposition

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

Fertilisers are inorganic and are produced in factories.

Multiple choice

Legume plants are important for the atmosphere because they

  1. help in nitrogen fixation

  2. do not help in nitrogen fixation

  3. increase the soil fertility

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The rhizobia bacteria in the soil invades the root and multiplies within its cortex cells. It helps in the nitrogen fixation, thereby increasing the fertility of the soil.

Multiple choice

Plant ash is an indication of

  1. organic matter of plants

  2. waste product

  3. mineral salts that are absorbed by plants

  4. None of the above

  5. -
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Plant ash content is a measure of the total amount of minerals that are present within a food or plant.

Multiple choice

Mycorrhiza promotes plant growth by

  1. absorbing inorganic ions from soil

  2. helping the plant in utilising atmospheric nitrogen

  3. protecting the plant from infection

  4. serving as a plant growth regulator

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhizal fungal filaments in the soil are truly extensions of root systems and are more effective in nutrient and water absorption than the roots themselves. More than 90 percent of plant species in natural areas form a symbiotic relationship with the beneficial mycorrhizal fungi.

Multiple choice

Mycorrhiza helps in

  1. uptake of nutrition

  2. food manufacturing

  3. disease resistance

  4. disease prevention

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mycorrhiza is a symbiotic association that is composed of a fungus and roots of a vascular plant. It helps in the uptake of nutrition.

Multiple choice

Plant ash indicates

  1. organic matter of plants

  2. mineral salts absorbed by the plants

  3. silica absorbed by the plants

  4. Both 1 and 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Plant ash includes all the mineral salts absorbed by the roots of the plants and the total organic matter present in the plants.

Multiple choice

Which of the following statements is not correct?

  1. Humans can impact soil formation by removing vegetation.

  2. Microorganisms help in increasing the soil fertility.

  3. Vegetation cannot prevent soil erosion.

  4. Growth of plants is affected by the density and pH of the soil.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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