Free Agronomy MCQs with Answers

• A. Relative humidity
• B. Both A and B
• C. Absolute humidity
• D. non of these

Explanation: Absolute humidity is the actual mass of water vapour present in a given volume of air.

• A. All the above
• B. Halophytes
• C. Xerophytes
• D. Saprophytes

Explanation: Saprophytes obtain nutrients from dead and decaying organic matter, helping decompose it and recycle nutrients.

• A. Mulching
• B. Soil solarization
• C. Fumigation
• D. None of the above

Explanation: Soil solarization uses transparent or black plastic to trap solar heat and raise soil temperature, helping control soil-borne pests…

• A. Ethane
• B. Ammonia
• C. Methane
• D. CO2

Explanation: Methane is produced when microorganisms decompose organic matter without oxygen, and it is the main energy-rich component of biogas.

• A. Infra blue radiation
• B. None of the above
• C. X rays
• D. Infra red radiation

Explanation: The Earth absorbs incoming short-wave solar radiation and emits the absorbed heat back mainly as long-wave infrared radiation.

• A. Xerophytes
• B. Thermophyts
• C. Mesophytes
• D. Halophytes

Explanation: Xerophytes are plants adapted to dry environments, commonly through deep roots, reduced leaves or waxy surfaces that limit water loss.

• A. Cropping pattern
• B. Cost benefit ratio
• C. Cropping intensity
• D. Cropping system

Explanation: Cropping intensity expresses how intensively land is used during a year, commonly calculated as gross cropped area divided by net…

• A. 60
• B. none of the above
• C. 95
• D. 80

Explanation: Pakistan covers approximately 79.6 million hectares, conventionally rounded to 80 million hectares.

• A. Seed sorter
• B. Seed blower
• C. Seed divider
• D. a and b

Explanation: A seed sorter separates and grades seed lots according to characteristics such as size, shape or density, while also helping remove…

• A. Lipase
• B. Nitrogenase
• C. Isomerase
• D. Kinease

Explanation: Nitrogenase is the enzyme complex that converts atmospheric nitrogen into ammonia during biological nitrogen fixation.

• A. Photosynthesis
• B. Nitrogen fixation
• C. aeration
• D. Respiration

Explanation: Root nodules of leguminous plants house Rhizobium bacteria, which convert atmospheric nitrogen into forms usable by the plant.

• A. Delay in germination
• B. Delay in growth
• C. Delay in ripening
• D. All the above

Explanation: Excess nitrogen promotes prolonged vegetative growth and can delay crop maturity and ripening.

• A. Leaves
• B. All the above
• C. Grain
• D. Straw

Explanation: Potassium is relatively mobile in plants and is commonly concentrated in vegetative parts, especially straw, rather than being stored…

• A. Active transport
• B. Passive transport
• C. Absorption
• D. Dissolution

Explanation: Active transport moves substances against their concentration gradient and therefore requires cellular energy, usually ATP.

• A. Woodstock (1973)
• B. Maguire (1962)
• C. Moore (1973)
• D. Germ (1950)

Explanation: Moore (1973) is associated with recommending tetrazolium staining for evaluating seed quality and viability.

• A. Fodder crops
• B. Leguminous crops
• C. Fiber crops
• D. Cereal crops

Explanation: Cereal crops are cultivated mainly for their grains, including wheat, rice, maize and barley.

• A. Chlorosis
• B. Leucoplast
• C. Chromoplast
• D. Chromoplast

Explanation: Chlorosis is the yellowing or pale colour of normally green plant tissue, usually caused by loss of chlorophyll or a nutrient deficiency.

• A. Metabolism
• B. Photosynthesis
• C. Absorption
• D. Assimilation

Explanation: Photosynthesis uses carbon dioxide and water, with light energy, to form carbohydrates in green plants.

• A. Yield performance
• B. Photosynthesis
• C. Root length of seeding
• D. All the above

Explanation: Drought response can be assessed through yield performance, reduced photosynthesis and traits such as seedling root length.

• A. LSD
• B. SPD
• C. AD
• D. RBD

Explanation: A Latin square design controls variation in two directions by arranging treatments in rows and columns, while also accounting for…