Plant Hormones - Tropisms & Auxins #52

• What is the focus of today's video?

  How plants respond to their environment
• Why do plants need to respond to stimuli?

  To survive in their environment
• How do plants sense light?

  By growing their shoots towards it
• What is the role of auxins in plants?

  They control growth at shoot and root ends
• How do auxins behave in shoots?

  They stimulate growth
• What is phototropism?

  A response to light in plants
• What is geotropism?

  A response to gravity in plants
• What happens to auxins in shaded areas of a plant?

  They accumulate on the shaded side
• How do shoots respond to light?

  They grow towards the light
• How do roots respond to gravity?

  They grow downwards towards the ground
• How does auxin accumulation affect shoot growth?

  It causes faster growth on the shaded side
• What is the effect of auxins on root growth?

  They inhibit growth in roots
• If a shoot is exposed to light from the left, which side will auxins accumulate?

  On the right side in the shade
• What happens to a root exposed to light?

  Auxins accumulate on the lower side
• How does gravity affect auxin distribution in roots?

  Auxins accumulate on the lower side
• What is the result of auxins accumulating on the lower side of a root?

  The upper side grows faster, curving downwards
• What is the opposite response of roots compared to shoots regarding light?

  Roots are negatively phototropic
• What is the opposite response of shoots compared to roots regarding gravity?

  Shoots are negatively geotropic
• How do auxins affect the growth direction of roots?

  They inhibit growth, causing upward curvature
• What happens to a root if it is exposed to light?

  It curves downwards due to auxin distribution
• What are the key responses of plants to environmental stimuli?

  • Phototropism: response to light
  • Geotropism (gravitropism): response to gravity
  • Auxins control growth direction
• What are the differences in auxin effects on shoots and roots?

  • Shoots: Auxins stimulate growth
  • Roots: Auxins inhibit growth
• How do auxins influence plant growth in shaded areas?

  • Accumulate on shaded side
  • Stimulate faster growth on that side
  • Cause curvature towards light
• How do auxins influence root growth when exposed to light?

  • Accumulate on lower side
  • Inhibit growth on that side
  • Cause curvature downwards