An indigenous method of renewing and maintaining soil fertility is by
clearing farms by burning
planting one crop type
adding inorganic fertilizers yearly
crop rotation and shifting cultivation
The diseases caused by water-borne pathogens include
gonorrhoea and poliomyelitis
typhoid and syphilis
tuberculosis and cholera
typhoid and cholera
The graph illustrates
the highest frequency for height of 2 metres
a discontinuously varying character
a continuously varying character
total yield in a cassava farm
The largest number of cassava plants has an approximate height of
1.4m
1.6m
1.8m
2.0m
Which of the following is true in blood transfusion?
person of blood group AB can donate blood only to another person of blood group AB
persons of blood groups A and B can donate or receive blood from each other
A person of blood group AB can receive blood only from persons of blood group A or B
A person of blood group O can donate only to a person of blood group O
