Question 49
NECO_MODEL_QUESTIONS_VOL1
•
2023
•
AGRICULTURAL_SCIENCE
•
objective
Explain how practising crop rotation with a leguminous crop followed by a cereal crop can improve soil fertility and reduce pest incidence in a farm ecosystem.
Answer Options
Correct Answer
A.
Legumes add nitrogen to the soil via rhizobia, providing a natural N source for the following cereal; the change in crop type breaks pest and disease cycles specific to cereals, reducing infestations, while varied root systems improve soil structure and organic matter, overall boosting fertility and pest control.
B.
Planting legumes first exhausts soil nutrients, requiring additional fertilizer for the cereal; crop rotation only changes the timing of planting, not pest cycles.
C.
Leguminous crops increase soil acidity, which harms subsequent cereals; the main benefit of rotation is aesthetic diversity, not fertility or pest control.
D.
Legumes fix carbon rather than nitrogen, so they do not contribute to soil nitrogen; the rotation mainly reduces soil erosion but has little effect on pests.
Correct Answer
A
Correct Option:
Legumes add nitrogen to the soil via rhizobia, providing a natural N source for the following cereal; the change in crop type breaks pest and disease cycles specific to cereals, reducing infestations, while varied root systems improve soil structure and organic matter, overall boosting fertility and pest control.
About This Question
This is
Neco Model Questions Vol1
2023
Agricultural Science
Question 49.
It is one of the
objective
questions from the
2023
Neco Model Questions Vol1
Agricultural Science
examination.
Difficulty level:
Easy
.