Agricultural Science

Question 1

1Base saturation of a soil refers to the

Hard

A. soil depth B. water content C. amount of sand D. proportion of exchange sites occupied by basic cations

Question 2

2Earthworms improve soil by

Easy

A. aerating it and mixing organic matter B. eating roots C. removing nutrients D. compacting it

Question 3

3An ideal soil for crops contains roughly what proportion of mineral matter by volume?

Medium

A. 25% B. 90% C. 45% D. 5%

Question 4

4The relative proportions of sand, silt and clay in a soil are its

Easy

A. colour B. depth C. texture D. structure

Question 5

5Soil structure refers to

Easy

A. soil colour B. soil depth C. the arrangement of soil particles into aggregates D. soil temperature

Question 6

6Soil texture refers to

Easy

A. soil depth B. soil temperature C. the proportion of sand, silt and clay D. soil colour

Question 7

7Lime is added to soil mainly to

Easy

A. reduce soil acidity B. make the soil more acidic C. kill all earthworms D. replace water

Question 8

8Capillarity in soil is highest in

Easy

A. sandy soils B. stony soils C. clay soils D. gravel

Question 9

9Soil pH affects

Easy

A. rainfall B. air temperature C. nutrient availability to plants D. soil colour only

Question 10

10Which soil is usually best for most crops?

Easy

A. gravel B. loam C. pure sand D. pure clay