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 zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Consider the following statements.
Mycorrhizal biotechnology has been used in rehabilitating degraded sites because mycorrhiza enables the plants to.
a. Resist drought and increase absorptive area
b. Tolerate extremes of pH.
c. Resist disease infestation
Of these statements.

  1. $2$ and $3$ are correct
  2. $1$ and $2$ are correct
  3. $1$ and $3$ are correct
  4. $1, 2$ and $3$ are correct
Reveal answer Fill a bubble to check yourself
A Correct answer
Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Azolla gives a good biofertilizer when mixed with

  1. Bone-meal

  2. Cowdung

  3. Blue-green algae

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

BGA and Azolla have known to be used for the rice cultivation and they are very good for increasing the crop yield and productivity as they supply the soil and the plant with enough nitrogen. They are known used together as the biofertilizers.


So, the correct option is 'Blue-green algae'

Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

If wheat field is inoculated with Rhizobium, then

  1. Soil will become nitrogen rich

  2. No effect on soil nitrogen

  3. Soil will be depleted of nitrogen

  4. Soil will become rich in calcium
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Rhizobium is an important symbiont for legumes but it plays an important role with nonlegumes by producing growth hormones. When wheat is inoculated with Rhizobium, no effects are observed in terms of growth and yield, which indicates that uptake of soil nitrogen is not seen as in legumes.

So, the correct answer is option B.

Multiple choice evs louis pasteur contribution of louis pasteur discoveries by louis pasteur discovery of microorganisms

The method of growing micro-organisms as a thin layer on a nutrient medium is known as

  1. Thin layer growth system

  2. Support growth system

  3. Suspended growth

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

Support growth system refers to a process in which the microorganisms are grown on a thin layer of nutrient medium. A nutrient medium provides various nutrients required for the growth of microorganism to carry out their metabolic activities. The nutrient media supports the growth of a wide range of microorganisms. So, the correct answer is 'Support growth system'.

Multiple choice biology plant growth other plant hormones cytokinins, ethylene and abscisic acid plant hormones

Farmers of a particular region are concerned that premature yellowing of leaves of pulse crop might cause decrease in the yield. Which treatment could be beneficial to obtain maximum seed yield?

  1. Application of iron and magnesium to promote chlorophyll synthesis

  2. Frequent irrigation of crop

  3. Treatment of plants with cytokinins along with a small dose of nitrogen fertilizer
  4. Removal of all yellow leaves and spraying the remaining green leaves with $2, 4, 5-$T
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cytokinins promote cell division and delay senescence (yellowing) in leaves, while nitrogen is essential for chlorophyll synthesis, helping to maintain green leaves and improve yield in pulse crops.

Multiple choice economics environment and sustainable development need for sustainable development environmental economics sustainable development

What are the benefits of using compost?

  1. It saves the land from harmful effects of chemical fertilisers

  2. Civic authorities are benefited too as they have to dispose off a reduced quantity of waste

  3. Both A and B

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

Composting provides a sustainable alternative to chemical fertilizers, reducing soil degradation, and helps municipal authorities by diverting organic waste from landfills.

Multiple choice

How does carbon get into the soil?

  1. When an animal dies

  2. When a plant dies

  3. When an animal urinates

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

When plants and animals die, their organic matter decomposes, returning carbon to the soil. Animal waste also contributes organic carbon to the soil environment.

Multiple choice

T/F: Plants can be grown without soil.

  1. TRUE

  2. FALSE
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Plants can be grown in water (hydroponics) or air (aeroponics) without traditional soil, provided they receive necessary nutrients.

Multiple choice

T/F: Soil provides most of the material for plant growth.

  1. TRUE

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

Plants primarily derive their mass from carbon dioxide in the air and water, not from the soil itself. Soil provides essential minerals and structural support, but it is not the main source of plant biomass.