Jamb Biology 2011 Past Questions and Answers

Question 21:

• JAMB 2011

Which of the following organs regulates the levels of water, salts , hydrogen ions and urea in the mammalian blood?

A. Liver
B. Kidney
C. Bladder
D. Colon

Question 22:

• JAMB 2011

The sequence of the one-way gaseous exchange mechanism in a fish is

A. Operculum → gills → mouth
B. Gills → operculum → mouth
C. Mouth → operculum → gils
D. Mouth → gills → operculum

Question 23:

• JAMB 2011

The type of asexual reproduction that is common to both Paramecium and protists is

A. Budding
B. Sporulation
C. Fragmentation
D. Fission

Question 24:

• JAMB 2011

In nature, plants and animals are perpetually engaged in mutualism because

A. They are rivals
B. All animals rely on food produced by plants
C. They utilize respiratory wastes of each other
D. They are neighbours

Question 25:

• JAMB 2011

In an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is

A. 16.7%
B. 17.6%
C. 26.7%
D. 16.2%