Agronomy MCQ Flashcards
7 cards from real Agronomy practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Agronomy MCQ flashcards as text
Which soil texture class has the highest water-holding capacity?
Answer: Clay
Clay soils have the highest water-holding capacity due to their small particle size and large surface area.
The process by which atmospheric nitrogen is converted into ammonia by microorganisms is called:
Answer: Biological nitrogen fixation
Biological nitrogen fixation is performed by microorganisms like Rhizobium that convert N₂ gas into ammonia (NH₃).
What is the primary purpose of crop rotation in agronomic systems?
Answer: Break pest and disease cycles
Crop rotation disrupts the life cycles of pests, pathogens, and weeds that are host-specific to a single crop.
Which nutrient deficiency causes interveinal chlorosis in young leaves?
Answer: Iron
Iron deficiency causes interveinal chlorosis in young (newest) leaves because iron is immobile in the plant.
The C4 photosynthetic pathway is advantageous over C3 in which condition?
Answer: High temperature and high light intensity
C4 plants like corn and sorghum use a carbon-concentrating mechanism that reduces photorespiration under hot, high-light conditions.
What does the term 'photoperiodism' refer to in crop production?
Answer: Plant response to relative lengths of day and night
Photoperiodism is a plant's physiological response to the ratio of light to dark periods, which controls flowering in many crops.
Which of the following is considered a legume cover crop used to improve soil nitrogen?
Answer: Hairy vetch
Hairy vetch (Vicia villosa) is a legume cover crop that fixes atmospheric nitrogen through its symbiotic relationship with Rhizobium bacteria.