Jamb Biology Past Questions and Answers

Question 221:

• JAMB 1981

Accommodation of the human eye is best described as the

A. Ability to see distant objects
B. Movement of upper and lower eyelids
C. Focusing of near and distant objects
D. Changing of lens shape due to varying light intensities
E. Constant adjustment of the iris

Question 222:

• JAMB 1981

Normally any character shown by an organism is due to the effects of

A. Hormones and chromosomes
B. Chromosomes
C. Mutation
D. Hormones and genes
E. Genes and enviroment

Question 223:

• JAMB 1981

Which of the following statement is NOT true of symbiosis?

A. Symbionts must be living
B. It is an association of 'give and take'
C. The association may involve two plants
D. Association between two similar species
E. Symbionts derive mutual benefit

Question 224:

• JAMB 1981

A person whose blood can be donated to all other people, must have the blood group

A. O
B. AB
C. B
D. A
E. None of the above

Question 225:

• JAMB 1981

If Benedict's solution gives a positive result in a food test, the food contains

A. Sugar
B. Protein
C. Oil
D. Fat
E. Cellulose