Waec Agricultural Science Past Questions For Year 2004
Question 36
What is the percentage porosity of a soil sample whose volume is 250cm when the volume of air is 200cm?
- A. 20
- B. 25
- C. 50
- D. 80
Question 37
Clay particles are able to attract cations in the soil because they
- A. are positively charged
- B. have excess negative charges
- C. are sticky
- D. can be moulded
Question 38
Igneous rocks formed within the crust are called
- A. guartzite
- B. volcanic
- C. plutonic
- D. stratified
Question 39
Which of the following will not lead to loss of nitrogen compounds from the soil?
- A. crop removal
- B. burning
- C. lodging
- D. leaching
Question 40
In the nitrogen cycle, nitrite is oxidized to nitrate by
- A. nitrobacter
- B. nitrosomonas
- C. azotobacter
- D. rhizobium
