Plants: Responses to their environment

Master plant tropism and nastic movements! Learn how plants respond to light, gravity, touch, and hormones.

Type in "True" or "False" for each statement. 1. Tropisms occur in response to the direction of external agents or stimuli. (True)2. Light, gravity, water, and touch are examples of stimuli that can cause tropic movements in plants. (True)3. Growth of a plant toward the light is an example of negative tropism. (False)4. Movement of growth in plants due to light is called phototropism. (True)5. Positive phototropism occurs when plant roots grow away from the light. (False)6. Shoots of a plant growing toward the light is an example of positive phototropism. (True)7. Growth of plants in response to gravity is called thigmotropism. (False)8. Thigmotropism occurs when tendrils come in contact with a solid object and they move towards it. (True). 9. Nastic movements are a response to stimuli in which the plant does not grow. (True)10. Sunflowers, venus fly traps, and mimosa plants are examples of plants with nastic movements. (True) Tropisms Select the picture that best represents the tropism. Thigmotropism Geotropism Phototropism Tropisms Match the word and description. Thigmotropism directional growth movement which occurs as a response to a touch stimulus Phototropism ability of a plant to grow directionally in response to a light source Geotropism growth of a plant in response to the force of gravity nastic response reversible and repeatable movements in response to a stimulus that does not result in growth tropic(tropism) response directional growth that occur in response to a directional stimulus positive tropism directional response towards stimulus negative tropism directional response away from stimulus Hormones and how they affect plant growth Use the article above to help identify which hormone causes what effect. Hormone Effects Auxin Promotes cell growth and elongation Abscisic Acid Stops growth, maintains seed dormancy Ethylene Promotes fruit ripening Gibberellins Promotes stem growth, fruit development, seed germination Cytokinins Promotes cell division and root growth