Jamb Biology 1997 Past Questions and Answers

Question 36:

• JAMB 1997

Adaptive features of plants to desert conditions include

A. Thick barks, succulent stems and sunken stomata
B. Thin barks, succulent stems and sunken stomata
C. Thin barks, air floats on stems and sunken stomata
D. Air spaces in tissues, adventitious roots and thick barks

Question 37:

• JAMB 1997

The Southern Guinea Savanna differs from the Northern Guinea Savanna in that it has

A. Lower rainfall and shorter grasses
B. Less grasses and scattered trees
C. More rainfall and taller grasses
D. Less arboreal and burrowing animals

Question 38:

• JAMB 1997

After a heavy rainfall and the formation of a large pond, the most likely sequence of changes in the vegetation of the pond is

A. Euglena → water lily → Spirogyra → grass
B. Water lily → Spirogyra →grass → Euglena
C. Spirogyra → Euglena → grass → water lily
D. Euglena → Spirogyra → water lily → grass

Question 39:

• JAMB 1997

In a soil sample, the relative amouunts of the different soil particles can best be determined by the process of

A. Filtration
B. Centrifugation
C. Precipitation
D. Sedimentation

Question 40:

• JAMB 1997

Which is the most important pollutant of the marine environment in Nigeria?

A. Insecticides
B. Sewage
C. Oil
D. Inorganic fertilizers