Understanding Phototropism and Auxin

The video explores how plants move towards or away from light, a phenomenon known as phototropism. It explains the role of auxin, a phytohormone, in this process. Auxin accumulates on the side of the plant away from the light, causing cells to elongate and the plant to bend towards the light. This is known as positive phototropism. The video also touches on the ongoing research into the exact mechanisms of auxin distribution and activation.

What is the term used to describe an organism's movement in response to light?

• Hydrotropism

• Geotropism

• Thigmotropism

• Phototropism

What is the term for a plant growing towards light?

• Positive phototropism

• Neutral phototropism

• Lateral phototropism

• Negative phototropism

Which molecule is primarily responsible for phototropism in plants?

• Chlorophyll

• Auxin

• Gibberellin

• Cytokinin

What effect does auxin have on plant cells on the side away from the light?

• It causes them to die

• It causes them to divide

• It causes them to elongate

• It causes them to shrink

What happens to a plant when the cells on one side elongate more than the other?

• The plant grows taller

• The plant stops growing

• The plant bends towards the side with more light

• The plant bends away from the side with more light

What is still being researched about auxin's role in phototropism?

• How auxin is produced

• How auxin is distributed in response to light

• How auxin is absorbed by roots

• How auxin affects photosynthesis

Which type of light is often responsible for auxin sensitivity in plants?

• Infrared light

• Yellow light

• Blue light

• Green light

What is a possible reason for auxin concentration being higher on the side away from the light?

• Auxin is absorbed by the soil

• Auxin migrates to the side with less light

• Auxin is produced more on the light side

• Auxin is destroyed by light

What is the effect of a more acidic environment created by auxin?

• It breaks down cell walls

• It strengthens cell walls

• It neutralizes cell walls

• It has no effect on cell walls

What is the main focus of the ongoing research on phototropism?

• The role of chlorophyll in phototropism

• The role of water in phototropism

• The exact mechanisms of auxin distribution

• The effect of temperature on phototropism