Auxins & Apical Dominance Quiz

What is the primary role of auxins in plant growth?

• To enhance root development

• To cause the stem to grow upwards

• To inhibit upward growth

• To promote lateral bud growth

What is apical dominance?

• The growth of roots over shoots

• The growth of leaves over flowers

• The suppression of lateral bud growth by auxins

• The dominance of lateral buds over the apical bud

What happens when the growing tip of a plant is removed?

• The plant stops growing

• Lateral buds start to grow

• The plant grows downward

• The plant dies

Why is upward growth generally more beneficial for plants?

• It enhances root stability

• It prevents herbivore grazing

• It ensures access to more light for photosynthesis

• It allows access to more water

What is the effect of replacing a decapitated plant tip with an agar block containing auxin?

• The plant stops growing

• The plant grows downward

• Lateral bud growth is inhibited

• Lateral buds grow

What is the source of auxins in a plant?

• The growing tip at the apex

• The lateral buds

• The roots

• The leaves

What happens to lateral shoots over time after the apical bud is removed?

• They grow horizontally

• They stop growing

• They curl up towards the light

• They grow downward

What is the result of apical dominance on plant growth?

• Increased root growth

• Increased lateral growth

• Preferential upward growth

• Increased leaf size

What experimental method can demonstrate the role of auxins in apical dominance?

• Removing the roots

• Decapitating the apical bud

• Adding fertilizer

• Increasing water supply

What is the effect of auxins on lateral buds?

• They have no effect

• They inhibit lateral bud growth

• They promote lateral bud growth

• They cause lateral buds to die