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 economics how does production take place? natural resources- air, water and land land land,labour, capital and entrepreneur production mechanism

_____ can kill bacteria and other micro organisms in the soil.

  1. Bio fertilizers

  2. Organic fertilizers

  3. Manure

  4. Homemade fertilizers

  5. Chemical fertilizers
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

A chemical fertilizer is defined as any inorganic material of wholly or partially synthetic origin that is added to the soil to sustain plant growth. Can also kill bacteria and other micro organisms in the soil.

Multiple choice evs - i rules are for everyone sustainability of natural resources adaptations - mangrove swamps, fast flowing rivers and treetops halophiles

Fertility of soil is measured by its ability to

  1. Retain nutrients

  2. Hold organic materials

  3. Hold water

  4. Support life
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The fertility of soil can be considered in different ways, depending on land use. In intensively managed agricultural and horticultural systems, and even in forestry, soil fertility can be defined in terms of the value of products produced. In nature soil gains nutrients from rocks, which are natural reservoirs of nutrients. These nutrients are released through geological processes, like leaching and pedogenesis. Soil also gains nutrients through the agencies of water and dead and decaying excreta of organisms. The physical characteristics of soil also govern nutrient availability of soil. The nutrient availability is a measure of soil fertility.

Multiple choice biology air and water pollution control environmental impact: global warming green house effect geobiochemical cycle

When the soil of the greenhouse nurseries is sterilized with methyl bromide gas, it leads to a deficiency of:

  1. cellulose in roots

  2. chlorophyll in green leaves

  3. zinc in plants

  4. iron in red flowers
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Greenhouse nursery is a plant nursery where the plants are kept protected by several types of rodent and pest control product. Use of $MeBr$ gas leads to a deficiency of $Zn$ in plants as methyl bromide is very toxic.

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

Which of the following statements is/are correct ?

  1. In paddy fields, cyanobacteria serve as an important biofertiliser.

  2. Vermicompost consists of organic matter prepared by the action of earthworms on human or animal waste.

  3. The important examples of cyanobacteria as biofertilisers are Anabaena, Nostoc and Oscoilatoria.

  4. All of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Biofertilizers

  1. Kill pests

  2. Prevent pest growth

  3. Retain soil fertility

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

Biofertilizers are used because they increase soil fertility, crop productivity, and production. Use of biofertilizers is both economical as well as environment-friendly. They remain symbiotically associated with the roots while some are free living. They solubilize the undissolved minerals.

So, the correct answer is option C.

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

Biofertilizer is?

  1. Manure

  2. Enriched manure

  3. Nutrient rich organisms

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

A biofertilizer is a substance which contains nutrient rich living microorganisms which colonize the rhizosphere or the interior of the plant and promotes the growth of the plant or the seed by increasing the availability of primary nutrients to the plant.

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

Vesicular arbuscular mycorrhizae (VAM) are important in

  1. Nitrate uptake

  2. Phosphate uptake

  3. Both A and B

  4. Sulphate uptake
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
An arbuscular mycorrhizal (AM) fungus is a type of mycorrhiza characterized by the formation of unique structures, arbuscules and vesicles. VAM fungi help plants to capture nutrients such as phosphorus, nitrogen and micronutrients from the soil. Vesicular-arbuscular mycorrhizae are important in helping the plant's nitrate and phosphate uptake. 
Thus, the correct answer is option C.
Multiple choice zoology microbes in human welfare biofertilizers microbes as biocontrol agents and biofertilizers manuring

Biofertilizers are

  1. Any free living soil bacteria

  2. Fertilizers formed by ploughing in legumes

  3. Fertilizers obtained by decay of dead organisms

  4. Fertilisers prepared by mixing cattle dung with crop residues
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biofertilizers are the suspension of microorganism which is formed by ploughing in legumes. They enrich the nutrient quality of the soil. The main sources of biofertilizers are bacteria, fungi, and cyanobacteria (blue-green algae). Biofertilizers will help solve such problems as increased salinity of the soil and chemical run-offs from the agricultural fields.

So, the correct answer is option B.

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

A green manure supplies

  1. Organic matter

  2. Additional nitrogen

  3. Protect soil against erosion and leaching

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

Green manure acts mainly as soil acidifying matter to decrease the alkalinity/pH of alkali soils by generating humic acid and acetic acid. The root systems of some varieties of green manure grow deep in the soil and bring up nutrient resources unavailable to shallower-rooted crops. Erosion control is often also taken into account when selecting which green manure cover crop to plant.

So, the correct answer is option D.

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

Sesbania rostrate is preferred as green manure over other species because.

  1. It grows quickly

  2. It has extensive root system

  3. It possesses nodules on both stem and roots

  4. It possesses leaf nodules
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sesbania rostrate is mainly used as green manure to improve the fertility of the soil due to its fast growth, high biomass production and the ability to convert atmospheric nitrogen into a usable form for plants.