The most active agent of physical weathering of rocks in arid regions is

A. ice

B. water

C. wind

D. animals

The chemical weathering that is responsible for changing haematite to limestone is

A. hydration

B. solution

C. oxidation

D. hydrolysis

Liming is used to correct soil's

A. neutrality

B. acidity

C. cation exchange capacity

D. porosity

A vertical section through the soil is referred to as soil

A. profile

B. horizon

C. structure

D. texture

In the determination of soil texture, a soil sample was found to be smooth and powdery when dry and formed a cast when wet. That soil is

A. clay

B. silt

C. loam

D. sand

Which of the following mineral elements is essential for chlorophyll formation?

A. sodium

B. molybdenum

C. boron

D. magnesium

Replenishing soil nutrients involves the following except

A. leaching

B. fallowing

C. cover cropping

D. liming

Which of the following is not a source of farm power?

A. wind

B. bull

C. tractor

D. plough

Which of the following sources of farm power will assist in the tillage of more land per unit time?

A. man

B. animal

C. wind

D. machine

A farm tool used for harvesting heads of rice is the

A. shear

B. secateur

C. sickle

D. rake