The Effects of Auxin on the Coordination of Plant Growth in Response to Light and Gravity

The video discusses the role of the plant hormone auxin in controlling plant growth in response to light and gravity. Auxin promotes cell elongation in shoots but inhibits it in roots. Phototropism is the growth of plants towards light, where auxin moves to the shaded side, causing the plant to bend towards the light. Gravitropism is the growth response to gravity, with shoots showing negative gravitropism by growing upwards and roots showing positive gravitropism by growing downwards. The unequal distribution of auxin leads to different growth rates in plant parts, directing their growth.

What is the primary role of auxin in plant shoots?

• Has no effect

• Encourages growth

• Inhibits growth

• Causes wilting

How do plant shoots respond to light in terms of growth?

• They grow away from the light

• They grow towards the light

• They stop growing

• They grow in random directions

What happens to auxin distribution when light hits one side of a plant shoot?

• Auxin moves towards the light

• Auxin remains evenly distributed

• Auxin evaporates

• Auxin moves away from the light

How do plant shoots typically grow in response to gravity?

• They grow against gravity

• They grow towards gravity

• They stop growing

• They grow horizontally

In plant roots, how does auxin affect growth in response to gravity?

• It causes roots to grow upwards

• It has no effect

• It inhibits growth on the lower side

• It encourages growth on the lower side