Jamb Biology Past Questions For Year 1993
Question 41
Two organisms of different species, living in close association but not dependent on each other are referred to as
- A. parasites
- B. commensals
- C. symbionts
- D. autotrophs
Question 42
At which trophic level would the highest accumulation of a non-biodegradable substance occur?
- A. Primary producers
- B. Tertiary consumers
- C. Primary consumers
- D. Secondary consumers
Question 43
During blood transfusion, agglutination may occur when
- A. contrasting antigens reacts with contrasting antibodies
- B. similar antigens react with similar antibodies
- C. two different antigens react with each other
- D. two different antibodies react with each other
Question 44
Which of the following is an example of discontinuous variation observed in man?
- A. Skin colours
- B. Tongue rolling
- C. Body weight
- D. Height
Question 45
Carbon monoxide poisons tissue by
- A. constricting the blood vessels
- B. killing the cells
- C. combining with haemoglobin
- D. rupturing the blood vessels
