Agronomy Agronomy MCQ 2

Question 1

Which soil texture class has the highest water-holding capacity?

Accepted Answer

Clay

Answer

Clay soils have the highest water-holding capacity due to their small particle size and large surface area.

Question 2

The process by which atmospheric nitrogen is converted into ammonia by microorganisms is called:

Accepted Answer

Biological nitrogen fixation

Answer

Biological nitrogen fixation is performed by microorganisms like Rhizobium that convert N₂ gas into ammonia (NH₃).

Question 3

What is the primary purpose of crop rotation in agronomic systems?

Accepted Answer

Break pest and disease cycles

Answer

Crop rotation disrupts the life cycles of pests, pathogens, and weeds that are host-specific to a single crop.

Question 4

Which nutrient deficiency causes interveinal chlorosis in young leaves?

Accepted Answer

Iron

Answer

Iron deficiency causes interveinal chlorosis in young (newest) leaves because iron is immobile in the plant.

Question 5

The C4 photosynthetic pathway is advantageous over C3 in which condition?

Accepted Answer

High temperature and high light intensity

Answer

C4 plants like corn and sorghum use a carbon-concentrating mechanism that reduces photorespiration under hot, high-light conditions.

Agronomy Practice Test