Which of the following describes the effects of excessive nitrogen application on the growth of maize plants?

A. high vegetative growth with low yield

B. high vegetative growth with high yield

C. low vegetative growth with high yield

D. low vegetative growth with low yield

Nitrogen is taken up by plant roots in the form of

A. nitrate ion

B. nitrite ion

C. nitric acid

D. nitrogen gas

In the process of recycling carbon in nature, carbondioxide is used by crops during

A. respiration

B. decomposition

C. photosynthesis

D. transpiration

Which of the following is not an effect of water-logging on crop production? it

A. inhibits plant development

B. encourages leaching

C. inhibits the activities of micro organisms in the soil

D. causes plant roots to wilt

When soils are poorly drained,

A. they dry up easily

B. they form hardpans

C. the air content of the soil is reduced

D. the rate of decomposition is accelerated

Which of the following sources of water is least useful for irrigation purposes?

A. sea

B. river

C. lake

D. borehole

Which of the following sources of farm power is most flexible and adaptable to farm operations?

A. animal power

B. wind power

C. human power

D. solar power

Which of the following sources of power supply to the farm is most unreliable?

A. wind

B. electricity

C. animal

D. machine

Animal power is usually used on the farm for

A. harvesting

B. spraying

C. ploughing

D. planting

The most appropriate farm implement for breaking up soil clod is the

A. harrow

B. plough

C. ridger

D. mower