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Plants exhibit movements due to growth, such as the tendrils of climbing plants and the directional growth of shoots and roots. These movements help plants adapt to their environment, responding to stimuli like light, gravity, and water through phenomena known as tropisms.
In this section, we explore how plants exhibit movement as a result of growth, primarily focusing on tropisms, which are directional movements towards or away from stimuli. An example includes the tendrils of climbing plants, which wrap around supports when they encounter them; this is due to differential growth where one side of the tendril grows faster than the other. Additionally, plants respond to light via phototropism, where shoots grow towards light, and to gravity via geotropism, where roots grow downwards. These adaptive movements ensure optimal exposure to sunlight and anchorage in the soil, thus enhancing the chances of survival. The section emphasizes that while some plant movements are quick, such as those seen in sensitive plants, growth-related movements tend to be slower and highlight the biological significance of hormone action in promoting this growth.
Growth Movement: Movement in plants as a result of growth processes.
Tropisms: Directional movements in response to environmental changes.
Auxins: Key hormones facilitating growth and directional movement in plants.
To grow towards the light, the shoot will sway, / Auxins promote growth in a sunny way.
Once upon a time, a little sunflower longed for the sun. Each morning it stretched and turned toward the light, seeking warmth and nourishment through its bending shoots.
A-D-G: Auxins, Directional growth, Geotropism.
The bending of sunflower stems towards sunlight (phototropism).
Roots growing down towards the gravitational pull (geotropism).
Tendrils of a pea plant wrapping around a fence for support.
Term: Phototropism
Definition: Directional growth of a plant shoot towards light.
Directional growth of a plant shoot towards light.
Term: Geotropism
Definition: Growth of plant roots downward in response to gravity.
Growth of plant roots downward in response to gravity.
Term: Tendril
Definition: A specialized structure used by climbing plants to attach and support themselves.
A specialized structure used by climbing plants to attach and support themselves.
Term: Auxin
Definition: A plant hormone that promotes elongation of cells, facilitating growth towards light.
A plant hormone that promotes elongation of cells, facilitating growth towards light.
Term: Hormone
Definition: A chemical substance produced in one part of an organism that influences growth and behavior in other parts.
A chemical substance produced in one part of an organism that influences growth and behavior in other parts.