Which of the following processes does not lead to the physical disintegration of rocks? The

A. heating and cooling of rock surfaces

B. expansion and contarction of rock minerals

C. formation of cracks and crevices

D. rapid cooling and solidification of rocks

The two main elements of climate which affect soil formation are

A. rainfall and temperature

B. rainfall and air

C. temperature and light

D. wind and relative hunidity

Soil erosion caused by water can be controlled by

A. overgrazing and bush burning

B. ploughing and harrowing

C. land clearing and stumping

D. afforestation and erection of bunds

Although clayey soils are rich in nutrients, they are not good for most agricultural crop production because they

A. do not release their nutrients

B. are too compact and poorly aerated

C. lose their nutrients too readily after rains

D. contain too much iron,aluminium and boron

The plant nutrient essential for the formation of tubers is

A. molybdenum

B. phosphorus

C. potassium

D. sodium

A fertilizer bag had the following inscription 27:10:10. This means that it contained

A. 27kg of nirogen, 10kg of phosphate, 10kg of potash

B. 27kg of phosphate, 10kg of potash, 10kg of nitrogen

C. 27kg of potash, 10kg of nitrogen, 10kg of phosphate

D. 27kg of sulphate, 10kg of potash, 10kg of phosphate

Which of the following farming practices encourages soil degradation?

A. fertilizer application

B. bush burning

C. cover cropping

D. fungicide application

Irrigation water is passed underneath the soil through

A. sprinklers

B. canals

C. drips

D. pipes

A good drought bull should not have

A. a deep barrel

B. a slopy rump

C. long legs

D. strong hooves

Which of the following sources of farm power generates highest amount of energy?

A. human power

B. wind power

C. animal power

D. mechanical power