Plant hormones (phytohormones) - Jamb Biology Past Questions and Answers

Question 1:

• JAMB 2019

A plant which grows on another plant without apparent harm to the host plant is called

A. An epiphyte
B. A saprophyte
C. A parasite
D. A predator
E. A hermaphrodite

Question 2:

• JAMB 1987

Unlike auxins, gibberellins

A. Induces the formation of adventitious roots
B. Do not affect leaf and fruit abscission
C. Cannot stimulate stem elongation
D. Are quite effective as herbicides

Question 3:

• JAMB 1994

The activity of ptyalin is likely to decrease with an increase in concentration of

A. Oxygen
B. Starch
C. Protein
D. Acid

Question 4:

• JAMB 1997

The substance that is responsible for optical dominance in plants is known as

A. Gibberellin
B. Tannin
C. Auxin
D. Kinin

Question 5:

• JAMB 2003

The most important hormone that induces the ripening of fruit is

A. Ethylene
B. Indole acetic acid
C. Gibberallin
D. Cytokinin