Auxins and Plant Responses

The video explores how plants respond to environmental stimuli using hormones, focusing on auxins. Auxins control growth in plant shoots and roots, with different effects: stimulating growth in shoots and inhibiting it in roots. The video covers phototropism (response to light) and geotropism (response to gravity), explaining how auxins accumulate on shaded or lower sides, affecting growth direction. Shoots are positively phototropic and negatively geotropic, while roots are the opposite. The video concludes with a summary of these concepts.

Why do plants need to respond to stimuli in their environment?

• To reproduce

• To produce seeds

• To survive

• To change color

What do plants rely on to respond to their environment?

• Nervous system

• Hormones

• Muscles

• Bones

Where are auxins produced in plants?

• In the flowers

• In the tips of shoots and roots

• In the roots

• In the leaves

What effect do auxins have on shoot growth?

• Cause wilting

• No effect

• Stimulate growth

• Inhibit growth

What is phototropism?

• Response to light

• Response to water

• Response to gravity

• Response to touch

In which direction do shoots grow in response to light?

• Away from light

• Downwards

• Towards light

• Horizontally

What is geotropism?

• Response to touch

• Response to light

• Response to gravity

• Response to water

How do roots respond to gravity?

• Grow horizontally

• Grow downwards

• Stop growing

• Grow upwards

What happens to auxins in roots when exposed to light?

• They accumulate on the upper side

• They accumulate on the lower side

• They stop functioning

• They spread evenly

What is the combined effect of light and gravity on root growth?

• Roots grow towards light and upwards

• Roots grow away from light and downwards

• Roots grow towards light and downwards

• Roots grow away from light and upwards