General Agriculture

Question 1

1The particle density of most mineral soils is about

Hard

A. 2.65 g/cm³ B. 5.5 g/cm³ C. 1.0 g/cm³ D. 0.5 g/cm³

Question 2

2Earthworms improve soil mainly by

Easy

A. removing nutrients B. eating all plant roots C. aerating and mixing it D. making it acidic

Question 3

3Yellowing of older leaves (chlorosis) in maize is usually a sign of lack of

Medium

A. calcium B. boron C. zinc D. nitrogen

Question 4

4A soil sample weighing 120 g wet and 100 g oven-dry has a moisture content (dry basis) of

Hard

A. 16.7% B. 120% C. 83% D. 20%

Question 5

5Soils with a pH below 7 are

Easy

A. acidic B. alkaline C. neutral D. saline only

Question 6

6Liming is done to correct soil that is

Easy

A. too acidic B. too wet C. too alkaline D. too sandy

Question 7

7Decomposed organic matter in the soil is called

Easy

A. parent rock B. subsoil C. gravel D. humus

Question 8

8The bulk density of a soil is calculated as

Hard

A. oven-dry mass ÷ total volume B. volume ÷ mass C. wet mass ÷ volume D. mass of particles ÷ particle volume

Question 9

9Soil acidity can be corrected by applying

Easy

A. urea B. sulphur C. ammonium sulphate D. lime

Question 10

10Organic manure improves soil by

Easy

A. adding nutrients and improving structure B. removing water C. killing earthworms D. making it acidic always