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MCQs on Soil fertility like ICAR-JEF, ICAR-SRF, ICAR-NET, IBPS-AFO/SO, Pre-PG, BHU Pre-PG, IFFCO-AGT, CCI, FCI, B.sc, M.sc, etc.
Question 1:
What is the term for the inherent capacity of the soil to supply plant nutrients in adequate quantities and suitable proportions?
Answer:
B) Soil fertility
Explanation:
Soil fertility refers to the inherent capacity of the soil to supply plant nutrients in adequate quantities and suitable proportions to support plant growth.
What does soil productivity refer to?
Answer:
A) The capacity of a soil to produce crops
Explanation:
Soil productivity is the capacity of a soil to produce crops. It is influenced by soil fertility and other factors like soil structure, moisture, and microbial activity.
Which of the following factors does NOT influence soil productivity?
Answer:
D) Soil color
Explanation:
Soil productivity is influenced by factors like soil fertility, physical condition, soil microorganisms, and moisture. Soil color does not have a direct impact on productivity.
Which type of nutrient loss is more prevalent in sandy soils?
Answer:
B) Leaching
Explanation:
Leaching is more prevalent in sandy soils because of their low water-holding capacity, causing nutrients to be washed away from the soil.
How can nutrients be lost from the soil through denitrification?
Answer:
D) In gaseous form
Explanation:
Denitrification is a process where soil bacteria convert nitrates into nitrogen gas (Nâ‚‚) or nitrous oxide (Nâ‚‚O), leading to nitrogen loss in gaseous form.
Which of the following practices can help maintain soil fertility?
Answer:
A) Regular addition of plant nutrients
Explanation:
Regular addition of plant nutrients helps maintain soil fertility by replenishing nutrients lost due to crop uptake, leaching, or other factors.
Which crop removes the most potassium (K) from the soil?
Answer:
C) Sorghum
Explanation:
Sorghum removes 200-300 kg/ha of potassium, which is the highest among the listed crops.
What is one method to prevent soil erosion, a common cause of fertility loss?
Answer:
A) Crop rotation
Explanation:
Crop rotation helps maintain soil structure and reduces soil erosion by providing continuous vegetation cover, minimizing wind and water erosion risks.
Why is soil organic matter important for maintaining soil fertility?
Answer:
A) It helps bind soil particles together
Explanation:
Soil organic matter improves soil structure by binding soil particles, enhancing moisture retention, and providing nutrients through decomposition.
Which of the following could be an inhibitory factor affecting soil productivity?
Answer:
B) Alkalinity
Explanation:
Alkalinity can inhibit plant growth by affecting nutrient availability and soil structure, reducing soil productivity.
Which of the following is a broader term used to indicate yields of crops?
Answer:
B) Soil productivity
Explanation:
Soil productivity encompasses not only soil fertility but also other factors that influence crop yields, such as water supply, land slope, and climate.
Soil fertility can be analyzed in the laboratory. What other term is evaluated in the field under particular climatic conditions?
Answer:
A) Soil productivity
Explanation:
Soil productivity is influenced by field conditions and climate, while soil fertility is typically assessed in a laboratory for nutrient availability.
Which process converts nitrate (NO₃) to nitrogen gas (N₂)?
Answer:
B) Denitrification
Explanation:
Denitrification is the process where nitrate (NO₃) is converted into nitrogen gas (N₂) by soil bacteria, resulting in nitrogen loss in gaseous form.
Which method helps maintain soil fertility through cultural practices?
Answer:
B) Using fallow periods
Explanation:
Fallow periods allow the soil to rest and replenish nutrients, helping maintain soil fertility as part of cultural practices.
Which of the following is an organic material used to maintain soil fertility?
Answer:
C) Compost
Explanation:
Compost is organic material derived from decomposed plant and animal matter, used to improve soil fertility and structure.
Which of the following can be used as a soil amendment to improve soil structure and fertility?
Answer:
A) Paddy husk
Explanation:
Paddy husk can improve soil structure by adding organic matter and aiding in soil aeration and drainage, contributing to soil fertility.
Which type of fertilizer involves using microorganisms to enhance soil fertility?
Answer:
B) Bio-fertilizers
Explanation:
Bio-fertilizers contain beneficial microorganisms like rhizobium, azotobacter, and blue-green algae, which enhance nutrient cycling and nitrogen fixation.
What is the potential status of soil in terms of nutrient availability?
Answer:
B) Soil fertility
Explanation:
Soil fertility refers to the potential status of the soil regarding its ability to supply plant nutrients in adequate quantities.
Which cultural practice involves growing different crops in the same field during different seasons to maintain soil fertility?
Answer:
C) Crop rotation
Explanation:
Crop rotation involves growing different crops in the same field in a systematic sequence, allowing the soil to regenerate and maintain fertility.
Which of the following represents the interaction of all factors that determine the magnitude of crop yields?
Answer:
A) Soil productivity
Explanation:
Soil productivity refers to the interaction of various factors, such as soil fertility, water supply, and land slope, that ultimately determine crop yields.