Jamb 1991 Biology Past Questions And Answers
1
Which of the following is likely to occur in a deciduous forest during the dry season?
- A. New leaves are formed
- B. The trees die off
- C. The undergrowth increases
- D. The ground becomes bare
2
Which of these is NOT an adaptive features for arboreal life?
- A. Possession of long tail
- B. Possession of claws
- C. Possession of teeths
- D. counter shading in coat colour
3
Pellagra can be prevented by taking food rich in
- A. vitamin A
- B. vitamin B
- C. Vitamin D
- D. calcium
4
In the earthworm, the cocoon is secreted by the
- A. chaeta
- B. prostomium
- C. peristomium
- D. citellum
5
Sources of air pollutants are
- A. industrial chimneys, burning fossil oils and river dam
- B. sulphur dioxide, acid rain and pesticides
- C. sulphur mines, vehicle exhausts and aerosols
- D. sewage, smoke and old vehicle
6
Which of the following are differentiated into true roots, stems and leaves
- A. Algae
- B. Schizophyta
- C. Pteridophyta
- D. Bryophyta
7
Which of the following diseases can be prevented by innoculation? A. Syphilis B. Malaria fever C. Tuberculosis D. Acquired Immune Deficiency Syndrom
- A. Syphilis
- B. Malaria fever
- C. Tuberculosis
- D. Acquired Immune Deficiency Syndrom
8
The exchange of genes between homologous chromosomes is called
- A. test cross
- B. back cross
- C. crossing-over
- D. mutation
9
The element common to protein carbohydrate and lipid is
- A. hydrogen
- B. sulphur
- C. nitrogen
- D. phosphorus
10
Fertilizers are lost from the soil through
- A. sheet erosion and evaporation
- B. leaching, underground seepages and run-off
- C. sheet erosion, gully erosion and wind erosion
- D. wind erosion and heavy rainfall