Jamb 1984 Biology Questions
Question 41:
Which of the following groups of factors is completely abiotic?
- A Salinity, tide, plankton, turbidity
- B Temperaure, pH, soil, insect
- C Wind, altitude, humidity, light
- D Conifers, wind, pH, rainfall
- E Soil, water, bacteria, salinity
Question 42:
Which of the following lists of diseases, their causes and transmission is CORRECT?
- A Cholera, virus, severe diarrhoea, infected water
- B Malaria, protozoan, high fever, contact with infected person
- C Syphilis, virus, veneral disease, sexual intercourse
- D Small pox, virus, skin with blister, close contact with infected person
- E Sleeping sickness, bacteria, tiredness, headache and dozing, tsetsefly bite
Question 43:
Erosion can be reduced along shape by
- A Ridging across slope
- B Ridging up slope
- C Ridging down slope
- D Crop rotation
- E Bush fallowing system
Question 44:
If a handful of soil is shaken with water and left to settle, the soil particles will settle from light to heavy particles as follows
- A Humus, clay, silt, sand, stones
- B Humus, silt, clay, sand, stones
- C Humus, clay,silt, stones, sand
- D Humus, sand, silt, clay, stones
- E Clay, humus, silt, sand, stones
Question 45:
Denitrifying bacteria in nature liberate gaseous nitrogen directly from
- A Ammonium salts
- B Soil nitrates
- C Thunderstorms
- D Soil nitrites
- E Plant and animal proteins