Question

test content
page 95 of 100
question 95
high levels of ______ promote seed dormancy.
a abscisic acid
b gibberellin
c ethylene
d cytokinins
e auxin

Explanation:

To solve this, we recall the functions of plant hormones:

• Abscisic acid (A) is known to promote seed dormancy and inhibit germination.
• Gibberellin (B) promotes seed germination and growth.
• Ethylene (C) is involved in fruit ripening and senescence.
• Cytokinins (D) promote cell division and growth.
• Auxin (E) is involved in growth, tropisms, and apical dominance.

Thus, high levels of abscisic acid promote seed dormancy.

Answer:

A. abscisic acid