Auxins and Phototropism Quiz

What do plant hormones promote?

• Growth within plants

• Decay of plant tissues

• Seed dispersal

• Color change in flowers

Where are auxins mostly made?

• In the growing stems and roots tips

• In the leaves

• In the flowers

• In the roots

What is phototropism?

• Movement of plants towards heat

• Shrinking of plants in the dark

• Growth of plant shoots towards the light

• Growth of plant roots towards water

How do stems respond to light?

• Positive phototropism

• No response

• Negative geotropism

• Negative phototropism

What is the effect of auxins on root cells?

• They grow more

• They grow less

• They change color

• They produce flowers

What causes the stem to grow towards the light?

• Equal distribution of auxin

• Greater concentration of auxin on the shaded side

• Less concentration of auxin on the shaded side

• Absence of auxin

What happens to the stems when no light reaches the tips?

• The stems grow longer

• The stems grow evenly and longer on both sides

• The stems do not grow

• The stems wilt

What is a positive tropism?

• The plant grows towards the stimulus

• The plant does not respond to the stimulus

• The plant grows away from the stimulus

• The plant changes color in response to the stimulus

What is the role of auxins in plant growth?

• Causing plants to produce fruits

• Promoting cell division and elongation

• Reducing the size of plant cells

• Inhibiting plant growth

What happens to the cells on the darker side of the stems?

• They grow shorter

• They grow longer

• They die

• They produce seeds