Studied by 2 people
Why do plants respond to Stimuli?
Plants need to be able to respond to Stimuli to grow towards light and water for photosynthesis
What is phototropism?
Phototropism is responding to light
What is gravitropism?
Gravitropism is responding to gravity
What is a phototropic response of stems?
A phototropic response of stems is to grow towards light in order to absorb the light for photosynthesis. Stems are positively phototropic
What is a geotropic response of stems?
A geotropic response of stems is to grow against the gravity in order to germinate out of the soil. Stems are negatively geotropic
What is a phototropic response of roots?
A phototropic response of roots is to grow away from light to ensure they grow into the soil in order to find water and nutrients. Roots are negatively phototropic
What is a geotropic response of roots?
A geotropic response of roots is to grow towards gravity in order to ensure they grow downwards to anchor the plant and search for water and nutrients. Roots are positively geotropic
What is the role of auxin in the phototropic response of stems?
Auxin is a plant growth hormone which is located in the just below the tips of growing shoots. Auxin stimulates the cell to elongate and if their is light all around the shoot, auxin is distributed evenly. However, if light shines on the shoot from one side, auxin will be distributed to the shaded side to make cells on that side elongate and grow
