Unlock hundreds more features
Save your Quiz to the Dashboard
View and Export Results
Use AI to Create Quizzes and Analyse Results

OR
Sign inSign in with Facebook
Sign inSign in with Google
Quizzes > Science

Agriculture Quiz: BSc-level Questions on Crops, Soil, and More

Quick, free agri quiz to test your knowledge. Instant results.

Editorial: Review CompletedCreated By: Robin ArvidssonUpdated Aug 25, 2025
Difficulty: Moderate
2-5mins
Learning OutcomesCheat Sheet
Paper art illustration for agricultural science quiz on a teal background

This agriculture quiz helps you practice key topics in crops, soil, livestock, and farm tools, and spot gaps fast. Use it for quick study or a warm-up before a test. For more practice, try our agriculture test questions, explore agriculture trivia questions, or review animal science questions.

What is the primary macronutrient that plants require in the largest quantity?
Calcium
Phosphorus
Nitrogen
Potassium
Nitrogen is a key component of amino acids, proteins, nucleic acids, and chlorophyll, making it essential for plant growth and photosynthesis. Among the primary macronutrients (nitrogen, phosphorus, and potassium), plants absorb nitrogen in the greatest amounts. A deficiency in nitrogen commonly causes stunted growth and chlorosis. .
Which of the following crops is classified as a cereal grain?
Sugarcane
Maize
Soybean
Cotton
Cereal grains are grasses harvested for their edible seeds, which serve as staple foods worldwide. Maize (corn) is one of the most widely grown cereals, alongside wheat, rice, and barley. Soybean is a legume, cotton provides fiber, and sugarcane is grown for its sugar-rich stalk. .
Photosynthesis in plant cells takes place in which organelle?
Nucleus
Chloroplast
Mitochondria
Vacuole
Chloroplasts contain chlorophyll, the pigment that captures light energy needed for photosynthesis. These organelles convert light energy, water, and carbon dioxide into glucose and oxygen. Mitochondria produce energy by respiration, while the nucleus stores genetic material and vacuoles store nutrients and waste. .
A soil pH value below 7 indicates that the soil is:
Neutral
Alkaline
Acidic
Saline
Soil pH is a measure of acidity or alkalinity on a scale of 0 to 14. Values below 7 indicate acidic conditions, while values above 7 indicate alkaline conditions. Neutral soils have a pH of exactly 7. Salinity refers to salt content, not pH level. .
Which bacteria in legume root nodules fixes atmospheric nitrogen?
Rhizobium bacteria
Azotobacter bacteria
Mycorrhizal fungi
Cyanobacteria
Rhizobium bacteria form symbiotic relationships with legume roots, creating nodules where they convert atmospheric nitrogen into a form plants can use. Azotobacter also fixes nitrogen but is free-living, not nodule-forming. Mycorrhizae aid in phosphorus uptake, and cyanobacteria fix nitrogen in aquatic environments. .
Which farming system integrates trees with crops or livestock on the same land?
Agroforestry
Monocropping
Hydroponics
Aquaculture
Agroforestry combines trees or shrubs with crops or livestock to create more diverse, productive, and sustainable land-use systems. Monocropping involves planting a single crop species over a large area. Hydroponics grows plants in nutrient solutions without soil, and aquaculture farms aquatic organisms. .
What term describes the layer of soil found directly below the topsoil?
Parent material
Bedrock
Topsoil
Subsoil
Soil is organized into horizons; the topsoil (A horizon) lies above the subsoil (B horizon). The subsoil accumulates minerals leached from the topsoil and often has less organic matter. Parent material (C horizon) and bedrock (R horizon) lie deeper. .
What is the main function of phosphorus in plants?
Water transport
Protein structure
Energy transfer (ATP)
Cell division
Phosphorus is a key component of ATP (adenosine triphosphate), which is crucial for energy transfer in cellular processes. It also forms part of nucleic acids and phospholipids but is primarily known for energy metabolism. A deficiency often leads to stunted growth and dark green or purplish leaves. .
Glyphosate is an example of which type of agrochemical?
Fungicide
Nematicide
Herbicide
Insecticide
Glyphosate is a broad-spectrum systemic herbicide used to kill weeds and grasses. It inhibits the EPSP synthase enzyme in the shikimate pathway, which is essential for plant growth. It is not effective against fungi, insects, or nematodes. .
Crop rotation is commonly used to reduce which of the following problems?
Soil fertility
Pest and disease buildup
Water retention
Photosynthetic rate
Rotating crops disrupts pest and pathogen life cycles by removing their preferred host, reducing buildup in the soil. It can also improve soil structure and fertility indirectly but is primarily aimed at pest management. Continuous monoculture tends to increase insect and disease pressure. .
In the NPK labeling of fertilizers, what does the 'K' represent?
Potassium
Nitrogen
Phosphorus
Potash
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K). The symbol 'K' comes from 'kalium,' the Latin name for potassium. Potash is a common source of potassium but is not the chemical symbol. .
Which irrigation method is considered the most water-efficient for crop production?
Flood irrigation
Furrow irrigation
Drip irrigation
Sprinkler irrigation
Drip irrigation delivers water directly to the root zone of plants, minimizing evaporation and runoff. It can achieve efficiencies of up to 90% or more. Flood and furrow systems lose more water to evaporation and percolation, while sprinklers can also lose water to wind drift. .
Which soil horizon is richest in organic matter?
A horizon
C horizon
R horizon
B horizon
The A horizon, or topsoil, contains the highest concentration of organic matter due to plant roots, decaying material, and microbial activity. Below it, the B horizon accumulates clays and minerals leached from the topsoil. The C horizon is weathered parent material, and the R horizon is unweathered bedrock. .
Biological pest control primarily utilizes which of the following?
Chemical pesticides
Beneficial organisms
Herbicide-resistant crops
Crop burning
Biological pest control uses natural enemies like predators, parasitoids, and pathogens to manage pest populations. This method reduces reliance on chemical pesticides and can be more sustainable. Herbicide-resistant crops and crop burning are not forms of biological control. .
What is the ideal carbon-to-nitrogen (C:N) ratio for efficient composting?
15:1
50:1
30:1
25:1
An ideal C:N ratio of around 30:1 balances carbon-rich 'browns' and nitrogen-rich 'greens' to optimize microbial activity and decomposition. Ratios significantly lower can lead to ammonia odors, while higher ratios slow down the process. Maintaining near 30:1 ensures efficient, odor-free composting. .
Systemic fungicides protect plants by:
Being absorbed and translocated within plant tissues
Targeting weeds rather than fungi
Acting only during seed treatment
Remaining on the leaf surface only
Systemic fungicides are taken up by plant tissues and moved throughout the plant's vascular system, providing internal protection against fungal pathogens. Contact fungicides remain on the surface and protect only where applied. Seed treatments are specific uses but not the definition of systemic action. .
The process of vernalization in plants refers to:
Hot treatment to prevent frost damage
Cold treatment to induce flowering
Application of fertilizer to promote growth
Exposure to light to break seed dormancy
Vernalization is the induction of a plant's flowering process by exposure to prolonged cold temperatures. It ensures plants flower at the appropriate season. This is different from stratification (cold treatment for seed germination) and unrelated to fertilizer application or frost protection. .
Leghemoglobin in legume root nodules primarily binds which gas?
Oxygen
Carbon dioxide
Nitrogen
Hydrogen
Leghemoglobin binds oxygen to maintain a low-oxygen environment in root nodules, protecting nitrogenase enzymes used by Rhizobium bacteria for nitrogen fixation. It does not bind nitrogen or carbon dioxide. This oxygen buffering is critical for efficient symbiotic nitrogen fixation. .
The practice of planting two or more crops together in the same field at the same time is called:
Intercropping
Strip cropping
Relay cropping
Monocropping
Intercropping involves growing two or more crops simultaneously on the same field to improve resource use and pest management. Monocropping grows one crop, relay cropping staggers planting times, and strip cropping separates crops into alternating strips. .
Which soil texture generally holds the most plant-available water?
Clay
Silt
Sand
Loam
Loam soils, which contain balanced proportions of sand, silt, and clay, typically offer the best combination of water retention and drainage for plant roots. Pure clay holds more total water but much of it is tightly bound and unavailable. Sandy soils drain quickly and hold less water. .
In arid and semi-arid regions, the primary mechanism of soil erosion is:
Gully erosion
Tillage erosion
Wind erosion
Sheet erosion by water
In dry climates, lack of vegetation and infrequent rainfall exposes soil to strong winds, causing wind erosion. Gully erosion and sheet erosion by water are more common in wetter regions. Tillage erosion is localized to cultivated lands but less widespread. .
The majority of nitrogen taken up by most crop plants is in the form of:
Amino acids
Ammonium (NH??)
Urea
Nitrate (NO??)
Most plants absorb nitrate from the soil because it is highly soluble and mobile in the soil profile. Ammonium can also be taken up but is less prevalent in well-aerated soils. Urea must be converted to ammonium and then nitrate before uptake. .
In C? photosynthesis, the initial carbon fixation by PEP carboxylase occurs in which cells?
Guard cells
Palisade cells
Mesophyll cells
Bundle sheath cells
In C? plants, PEP carboxylase in mesophyll cells initially fixes CO? into a four-carbon compound, which is then transported to bundle sheath cells for the Calvin cycle. This spatial separation increases photosynthetic efficiency under high light and temperature. .
Which type of mycorrhizal association is most widespread among agricultural crop plants?
Ericoid mycorrhiza
Arbuscular mycorrhiza
Orchid mycorrhiza
Ectomycorrhiza
Arbuscular mycorrhizae form associations with the majority of crop species, facilitating phosphorus uptake and improving soil structure. Ectomycorrhizae are common in trees, while ericoid and orchid mycorrhizae are specialized associations with specific plant families. .
Remote sensing for monitoring crop health often relies on which spectral index?
Soil Adjusted Vegetation Index (SAVI)
Enhanced Vegetation Index (EVI)
Green Chlorophyll Index (GCI)
Normalized Difference Vegetation Index (NDVI)
NDVI is widely used to assess vegetation vigor by comparing near-infrared and red light reflectance. It provides a reliable indicator of plant health, biomass, and stress. Other indices like EVI and SAVI are also used but NDVI remains the most established. .
0
{"name":"What is the primary macronutrient that plants require in the largest quantity?", "url":"https://www.quiz-maker.com/QPREVIEW","txt":"What is the primary macronutrient that plants require in the largest quantity?, Which of the following crops is classified as a cereal grain?, Photosynthesis in plant cells takes place in which organelle?","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}

Study Outcomes

  1. Answer Agric Questions Confidently -

    Sharpen your skills to tackle a wide range of agric questions with accuracy and speed.

  2. Understand Agronomy Fundamentals -

    Grasp essential agronomy concepts such as soil management, crop rotation, and nutrient cycles.

  3. Analyze Crop Science Concepts -

    Distinguish between different crop species and understand their physiological processes and growth requirements.

  4. Recall Farm Science Trivia -

    Memorize key facts and statistics from farm science trivia to enhance your foundational agricultural knowledge.

  5. Evaluate Your Agricultural Proficiency -

    Review your quiz results to identify strengths and areas for growth in agricultural science.

Cheat Sheet

  1. Maximizing Photosynthesis Efficiency -

    Understanding the photosynthesis equation (6CO2 + 6H2O → C6H12O6 + 6O2) helps answer many agric questions and strengthen your agronomy quiz performance. A simple mnemonic "CCP" (Calvin Cycle Produces Carbohydrates) can help recall that carbon fixation occurs in the Calvin Cycle (FAO, 2019). This concept is the backbone of yield prediction in C3 and C4 crops (USDA NRCS).

  2. Applying the 4R Nutrient Stewardship -

    The 4R framework (Right source, Right rate, Right time, Right place) is crucial for balanced fertilizer use in farm science trivia and agricultural science quiz prep. Remember "4Rs, 1 Goal" to maintain soil health and reduce nutrient loss (IPNI, 2020). This approach optimizes crop uptake and mitigates environmental impact.

  3. Leveraging Crop Rotation with Legumes -

    Rotating cereals with legumes like soybeans or clover enhances soil nitrogen levels through biological fixation, a staple concept in agric questions and crop science questions sections. Use the mnemonic "Legumes Love Nitrogen" to recall that legume nodules house Rhizobium bacteria (University of Illinois Extension). This practice improves yield stability and pest management.

  4. Implementing Integrated Pest Management (IPM) -

    IPM integrates biological, cultural, mechanical, and chemical controls to manage pests sustainably, making it a common topic on farm science trivia quizzes. An easy threshold rule is "X pests per Y leaves" before action, reducing overreliance on pesticides (FAO, 2018). Practicing crop scouting builds confidence for any agronomy quiz.

  5. Calculating Optimal Plant Population Density -

    Use the formula Plants/ha = (10,000 m²/ha × 100 cm/m)/(Row spacing cm × In-row spacing cm) to nail population density questions in your agricultural science quiz. A handy tip: visualize a 1-hectare grid of 10,000 squares to simplify the math (University of California Davis). Accurate spacing boosts resource use efficiency and yield potential.

Make a Quiz (FREE) Copy & Edit This Quiz Create a Quiz with AI

Other Sciences Quizzes

Powered by: Quiz Maker