Apical Dominance and Auxin Expression

What is the mechanism of apical dominance?

• Apical dominance is a result of lateral bud growth stimulation

• Apical dominance is controlled by the plant hormone cytokinin

• Apical dominance is caused by excessive sunlight exposure

• The mechanism of apical dominance is primarily controlled by the plant hormone auxin, which is produced in the terminal bud and transported downwards to inhibit the growth of lateral buds.

How does auxin affect lateral buds?

• Auxin causes lateral buds to change color.

• Auxin inhibits the growth of lateral buds.

• Auxin has no effect on lateral buds.

• Auxin promotes the growth of lateral buds.

What regulates auxin expression in plants?

• Light, gravity, and other hormones

• Wind direction, humidity, and nutrients

• Temperature, soil pH, and water availability

• Time of day, plant age, and leaf color

Which signaling pathways are involved in apical dominance?

• Auxin signaling and strigolactone signaling

• Jasmonic acid signaling and Ethylene signaling

• Cytokinin signaling and Gibberellin signaling

• Brassinosteroid signaling and Abscisic acid signaling

Explain the role of auxin in suppressing lateral bud growth.

• Auxin suppresses lateral bud growth by inhibiting their outgrowth and promoting apical dominance.

• Auxin only affects root growth, not lateral bud growth

• Auxin has no effect on lateral bud growth

• Auxin promotes lateral bud growth by enhancing their outgrowth

Describe the process of apical dominance in plants.

• Apical dominance in plants is controlled by auxin produced in the terminal bud, which suppresses the growth of lateral buds.

• Apical dominance is caused by a lack of water reaching the terminal bud.

• Apical dominance is a result of excessive sunlight exposure on lateral buds.

• Apical dominance is controlled by cytokinins produced in lateral buds.

How can auxin levels be manipulated to control apical dominance?

• Prune the roots to manipulate auxin distribution

• Increase auxin levels by removing lateral buds

• Apply a growth hormone to decrease auxin levels

• Remove the apical bud to reduce auxin levels and promote lateral bud growth.

Discuss the importance of auxin transport in apical dominance.

• Auxin transport is important in apical dominance as it suppresses the growth of lateral buds, promoting the vertical growth of the main shoot.

• Apical dominance is solely regulated by cytokinins

• Auxin transport leads to lateral bud growth instead of suppressing it

• Auxin transport has no impact on apical dominance

What are the effects of high auxin levels on lateral bud growth?

• Promotion of root growth

• Stimulation of lateral bud growth

• Inhibition of lateral bud growth

• No effect on lateral bud growth

How do cytokinins interact with auxin in regulating apical dominance?

• Cytokinins enhance auxin activity by directly stimulating auxin production in the main shoot.

• Cytokinins antagonize auxin by promoting bud outgrowth and inhibiting auxin production in the main shoot.

• Cytokinins inhibit bud outgrowth by promoting auxin production in the main shoot.

• Cytokinins and auxin have no interaction in regulating apical dominance.