Auxin and Plant Growth Responses

This video explores plant hormones and growth, focusing on tropism and nastic responses. It explains how plants grow towards or away from stimuli like light, chemicals, water, and gravity. The video also covers phototropism in detail, highlighting the role of auxin in plant growth and how it helps plants optimize photosynthesis by bending towards sunlight.

What is the term used to describe the growth of plants towards a stimulus?

• Tropism

• Nastic response

• Photosynthesis

• Geotropism

Which type of tropism involves plant growth towards light?

• Geotropism

• Phototropism

• Hydrotropism

• Chemotropism

What is chemotropism?

• Growth towards light

• Growth towards chemicals

• Growth towards water

• Growth towards gravity

How do plants respond to unfavorable chemicals?

• They grow faster

• They stop growing

• They grow away from them

• They grow towards them

What is a nastic response?

• A growth towards water

• A directional growth towards a stimulus

• A growth towards light

• A non-directional response to a stimulus

What part of the plant is responsible for growth towards sunlight?

• Leaf

• Root

• Apical meristem

• Stem

What is the role of auxin in plant growth?

• It inhibits growth

• It stimulates growth

• It has no effect on growth

• It causes plants to wilt

How does auxin affect cells on the shaded side of a plant?

• It causes them to divide and enlarge

• It causes them to shrink

• It causes them to change color

• It causes them to die

What is the function of auxin efflux pumps?

• They inhibit auxin production

• They transport auxin to the light side

• They transport auxin to the shaded side

• They produce auxin

What is the significance of auxin in photosynthesis?

• It reduces photosynthesis

• It stops photosynthesis

• It optimizes photosynthesis by directing growth towards light

• It has no effect on photosynthesis