Jamb Biology Past Questions For Year 1991
Question 36
The movement of the whole organism to an external stimulus is termed
- A. tropism
- B. a taxis
- C. a nastic movement
- D. a phototropic movement
Question 37
Which of the following is a plant excretory product?
- A. Oil
- B. Cytokinin
- C. Resin
- D. Amino acids
Question 38
The exchange of genes between homologous chromosomes is called
- A. test cross
- B. back cross
- C. crossing-over
- D. mutation
Question 39
The greatest contribution to genetic studies was made by
- A. Thomas Morgan
- B. Gregor Mendel
- C. Charles Darwin
- D. Robert Hooke
Question 40
A dwarf plant can be stimulated to grow to normal height by the application of
- A. thyroxin
- B. gibberellin
- C. insulin
- D. kinin
