JAMB and WAEC Agricultural Science questions

597 questions with answers and explanations. Tap an option to check yourself.

All topics Agricultural economics and extension · 41 Animal pests and diseases · 38 Animal reproduction and nutrition · 38 Classification and anatomy of farm animals · 37 Crop classification and propagation · 36 Crop pests and diseases · 39 Farm tools and mechanisation · 35 Fisheries and aquaculture · 35 Forestry · 33 Husbandry of field crops · 41 Irrigation and drainage · 36 Livestock management · 37 Meaning and importance of agriculture · 36 Soil fertility, manures and fertilisers · 43 Soil formation and properties · 39 Weeds and weed control · 33

Question 561· Soil formation and properties· WAEC
Wind is an agent of
Show answer
Answer: A. physical weathering and erosion
Explanation and discussion
Question 562· Soil formation and properties· WAEC
The breakdown of rocks by repeated heating and cooling is
Show answer
Answer: D. physical weathering
Explanation and discussion
Question 563· Soil formation and properties· JAMB
Soil air is important because it
Show answer
Answer: B. supplies oxygen for root respiration and soil organisms
Explanation and discussion
Question 564· Soil formation and properties· JAMB
Which soil horizon is called the zone of accumulation?
Show answer
Answer: C. B horizon
Explanation and discussion
Question 565· Weeds and weed control· WAEC
Water hyacinth is a weed problem mainly in
Show answer
Answer: D. rivers and lakes
Explanation and discussion
Question 566· Weeds and weed control· WAEC
Which is a cultural method of weed control?
Show answer
Answer: A. crop rotation and proper spacing
Explanation and discussion
Question 567· Weeds and weed control· WAEC
Weeds reduce crop yield mainly by
Show answer
Answer: D. competing with crops for light, water and nutrients
Explanation and discussion
Question 568· Weeds and weed control· WAEC
A herbicide that kills only certain plants and leaves the crop unharmed is
Show answer
Answer: B. selective
Explanation and discussion
Question 569· Weeds and weed control· WAEC
Seeds of many weeds remain viable in the soil for a long time because of
Show answer
Answer: D. dormancy
Explanation and discussion
Question 570· Weeds and weed control· WAEC
Paraquat is a
Show answer
Answer: A. non-selective contact herbicide
Explanation and discussion
Question 571· Weeds and weed control· WAEC
Striga (witchweed) harms sorghum and maize by
Show answer
Answer: D. attaching to their roots and drawing nutrients
Explanation and discussion
Question 572· Weeds and weed control· JAMB
Striga (witchweed) is a weed that
Show answer
Answer: B. lives as a parasite on the roots of cereals such as sorghum and maize
Explanation and discussion
Question 573· Weeds and weed control· WAEC
A weed is best described as
Show answer
Answer: D. a plant growing where it is not wanted
Explanation and discussion
Question 574· Weeds and weed control· WAEC
A useful feature of some weeds is that they
Show answer
Answer: C. serve as food or medicine
Explanation and discussion
Question 575· Weeds and weed control· JAMB
A herbicide applied to the soil before the crop or weeds emerge is a
Show answer
Answer: D. pre-emergence herbicide
Explanation and discussion
Question 576· Weeds and weed control· WAEC
Which of these is a cultural method of weed control?
Show answer
Answer: B. mulching
Explanation and discussion
Question 577· Weeds and weed control· JAMB
Post-emergence herbicides are applied
Show answer
Answer: C. after the weeds have emerged
Explanation and discussion
Question 578· Weeds and weed control· WAEC
Some weeds reduce crop quality at harvest by
Show answer
Answer: B. mixing their seeds with the harvested grain
Explanation and discussion
Question 579· Weeds and weed control· JAMB
Herbicides that kill some plants but leave others unharmed are
Show answer
Answer: B. selective herbicides
Explanation and discussion
Question 580· Weeds and weed control· JAMB
Which of these is a mechanical method of weed control?
Show answer
Answer: B. hoeing
Explanation and discussion

Practise Agricultural Science like the real exam. A timed CBT, your score, and the topics to fix.

Start a Agricultural Science test

JAMB and WAEC Agricultural Science questions

Wind is an agent of

The breakdown of rocks by repeated heating and cooling is

Soil air is important because it

Which soil horizon is called the zone of accumulation?

Water hyacinth is a weed problem mainly in

Which is a cultural method of weed control?

Weeds reduce crop yield mainly by

A herbicide that kills only certain plants and leaves the crop unharmed is

Seeds of many weeds remain viable in the soil for a long time because of

Paraquat is a

Striga (witchweed) harms sorghum and maize by

Striga (witchweed) is a weed that

A weed is best described as

A useful feature of some weeds is that they

A herbicide applied to the soil before the crop or weeds emerge is a

Which of these is a cultural method of weed control?

Post-emergence herbicides are applied

Some weeds reduce crop quality at harvest by

Herbicides that kill some plants but leave others unharmed are

Which of these is a mechanical method of weed control?