Waec 1993 Biology Past Questions And Answers
One of the factors that must be considered for safe blood transfusion is
- A. social class of the donor
- B. age of the recipient
- D. nationality of the donor
- C. rhesus factors of the donor and the recipient
One of the major criticisms against ‘Mendelian laws is that they do not recognize that
- A. one trait is often controlled by many pairs of genes
- B. single factor inheritance is never a reality
- C. complete dominance is always possible
- D. incomplete dominance is not possible
(a) Describe the process of inhalation in man .
(b) Describe briefly the process of gaseous exchange in the shoo: system of flowering plants.
(c) Describe an experiment to demonstrate the effect of distilled water on mammalian red blood cell.
View Discussion (0)WAEC 1993 THEORYThe conditions that ensure successful exchange of gases in multicellular organisms include the following except
- A. concentration gradient across the respiratory surface
- B. concentration gradient across the respiratory surface B. presence of thin membrane as the respiratory surface
- C. last transportation of absorbed gases
- D. presence of small, dry surface area of the respiratory organ
Identical twins inherit their genes from
- A. the same ovum and different sperms
- B. the same sperm and different ova
- C. different sperms and many ova
- D. the same ovum and the same sperm
The first scientist to describe the cell was
- A. Theodor Schwann
- B. Felix Dujardin
- C. Robert Hooke
- D. Charles Darwin
Which of the following diseases or disorders can be prevented by the application of the knowledge of heredity through marriage counselling?
- A. Sickle cell anaemia
- B. Haemophilia
- C. Diabetes mellitus
- D. Colour blindness
Which of the following substances cannot control the growth of harmful micro organisms?
- A. Antibiotics
- B. Hypertonic salt solution
- C. Disinfectants
- D. isotonic sugar solution
The process whereby microorganisms can convert atmospheric nitrogen into nitrogenous compound is known as
- A. nitrogen cycle
- B. nitrogen fixation
- C. denitrification
- D. putrefaction
The offspring produced when pure strains interbreed is described as
- A. dominance
- B. phenotype
- C. allele
- D. hybrid