SOIL - Jamb Biology Past Questions and Answers

Question 46:

• JAMB 1999

A soil consisting of alumina and iron (II)oxide is known as

A. Loamy soil
B. Clayey soil
C. Laterite
D. Podzol

Question 47:

• JAMB 2000

Atmospheric nitrogen is converted to soil nitrogen for plant use by

A. Nitrification and combustion
B. Putrefaction and lightning
C. Lightning and nitrification
D. Combustion and putrefaction

Question 48:

• JAMB 2000

The soil becomes toxic to plants when the concentration of its essential elements is in the range labelled

A. IV
B. III
C. II
D. I

Question 49:

• JAMB 2000

The range at which soil essential elements concentration is recorded for optimal plant growth is marked

A. IV
B. III
C. II
D. I

Question 50:

• JAMB 2002

The addition of lime to clayed soil serves to

A. Aid water retention
B. Close up the texture
C. Prevent water logging
D. Improve capillary action