Waec Agricultural Science 2013 Past Questions and Answers

Question 11:

• WAEC 2013

When compost is added to said, it

A. Reduces the activities of living organisms
B. Increases the porosity of the soil
C. Increases water-holding capacity of the soil
D. Decreases the soil acidity

Question 12:

• WAEC 2013

Soils can become acidic as a result of the continuous application of

A. Single superphosphate
B. Sulphate of ammonia
C. Muriate of potash
D. NPK 15: 15: 15

Question 13:

• WAEC 2013

Which of the following species of bacteria lives symbiotically in root nodules of legumes?

A. Azotobacter
B. Clostridium
C. Nitrobacter
D. Rhizobium

Question 14:

• WAEC 2013

Plant nutrients are restored during the fallow period through

A. Reduced soil erosion
B. Accumulation of soil organic matter
C. Reduced evaporation from the soil
D. Accumulation of farmyard manure

Question 15:

• WAEC 2013

The processes by which animals release carbon dioxide into the air are

A. Respiration and decay
B. Respiration and ammonification
C. Nitrification and decay
D. Denitriflcatin and ammonification