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Biology Past Questions and Answers

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Biology Questions

Question 436:

Soil erosion CANNOT be controlled by

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A Planting cover crops
B Contouring of sloping ground
C Terracing of slopes
D Laying of mulch
E Burning of bush

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Question 437:

Water retention is highest in soils which are rich in

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A Sand, poor in humus and devoid of clay
B Clay and sand, but poor in humus
C Clay and humus, but poor in sand
D Clay, poor in humus and devoid of sand
E Sand and humus, but poor in clay

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Question 438:

The origin of mineral particles in the soil is

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A Humus
B Water
C Micro-organisms
D Weathered rock
E Organic matter

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Question 439:

Atmospheric nitrogen is directly replenished in nature through

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A The activities of denitrifying bacteria
B The breakdown of ammonium salts in the soil
C The activities of nitrifying bacteria
D The activities of nitrogen-fixing bacteria in root nodules
E Egestion, death and decay

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Question 440:

The initial volume of water poured into 60g bag of dry soil was 50ml and the amount that drained through was 35ml. The percentage water content of the fully soaked soil is therefore

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A 46.7
B 25.0
C 20.0
D 30.0
E 58.3

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