Coordination in plants Flashcards
What is tropism?
Tropism is a plant’s growth response to a stimulus, such as light or gravity.
What is phototropism?
Phototropism is a plant’s growth response to light.
How do plant stems respond to light?
Plant stems bend towards the light, showing positive phototropism.
What is the advantage of positive phototropism?
It allows more light absorption, leading to increased photosynthesis and growth.
Which plant hormone is responsible for phototropism?
Auxins control phototropism by regulating cell elongation.
Where are auxins produced?
Auxins are produced at the tip of the stem.
What happens to auxins in response to strong directional light?
Auxins diffuse away from the light and accumulate on the shaded side of the stem.
How do auxins cause bending towards the light?
Auxins stimulate cell elongation on the shaded side, making the stem bend towards the light
What is geotropism?
Geotropism is a plant’s growth response to gravity.
How do plant roots respond to gravity?
Roots grow downwards, showing positive geotropism.
Why is positive geotropism in roots beneficial?
- Anchors the plant securely in the soil.
- Helps roots absorb water and mineral ions.
