Question

plant tropisms directions watch the following video links to complete the worksheet below on plant hormones and plant tropisms. pause the videos when needed to answer the questions below. video links link 1 https://www.youtube.com/watch?v=pcfstsmvami link 2 (a great song that you should check out!) https://www.youtube.com/watch?v=ux5eoxkbzhe 1. what is a plant tropism? 2. what is the difference between positive and negative tropism? 3. describe each of the following tropisms: tropism geo/gravitropism hydrotropism phototropism thigmotropism definition copy and paste an image to remember the response

Explanation:

1. A plant tropism is a growth - movement response of a plant to an external stimulus.
2. Positive tropism is when a plant grows towards a stimulus, while negative tropism is when a plant grows away from a stimulus.
3. Thigmotropism is a response to touch, phototropism to light, hydrotropism to water, and geotropism (gravitropism) to gravity. For example, roots show positive geotropism (grow towards gravity) and negative phototropism (grow away from light), while shoots show positive phototropism (grow towards light) and negative geotropism (grow away from gravity).

Answer:

1. A plant tropism is a directional growth response of a plant to an external environmental stimulus.
2. Positive tropism means the plant grows towards the stimulus, and negative tropism means the plant grows away from the stimulus.
3. Thigmotropism: Growth response to touch. Example: Tendrils of climbing plants coiling around supports.

Phototropism: Growth response to light. Example: Plants bending towards a light source.
Hydrotropism: Growth response to water. Example: Roots growing towards a water - rich area.
Geotropism (Gravitropism): Growth response to gravity. Example: Roots growing downwards (positive geotropism) and shoots growing upwards (negative geotropism).