I was doing a lab about tropism in plants. I used mustard seeds and they had a positive growth. I do not understand the question...
Classify the responses you observed as positive or negative tropisms.
Here is a definition of tropism.
http://www.google.com/search?q=define%3Atropism&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a
If the mustard seeds had a positive growth rate I would think that meant that they had a positive tropism.
Ok I get it thank you.
In the context of plants, tropism refers to the growth or movement of a plant in response to an external stimulus, such as light, gravity, or touch. There are several types of tropisms, including positive and negative tropisms.
A positive tropism occurs when the plant grows or moves towards the source of the stimulus. For example, if a plant is exhibiting positive phototropism, it means that it is growing towards the light source. Similarly, if a plant is showing positive gravitropism, it means that the roots are growing downwards, towards the force of gravity.
On the other hand, negative tropism occurs when the plant grows or moves away from the source of the stimulus. For example, if a plant is exhibiting negative phototropism, it means that it is growing away from the light source. Negatively gravitropic growth would involve the plant growing upward, against the force of gravity.
Now, coming back to your observation with the mustard seeds, you mentioned that they had positive growth. Without knowing the specific details of your experiment, it is difficult to determine the exact type of tropism exhibited by the mustard seeds. However, based on your statement that they had positive growth, it suggests that the mustard seeds displayed positive tropism towards some stimulus in your experiment.
To classify the responses as positive or negative tropisms, you need to identify the external factor that influenced the growth of the mustard seeds. For example, if the mustard seeds grew towards a particular light source, it would be classified as positive phototropism. Alternatively, if the mustard seeds grew in the opposite direction away from the light source, it would be classified as negative phototropism.
Similarly, if you had experimented with gravity and observed that the roots of the mustard seeds grew downwards, it would be classified as positive gravitropism. On the other hand, if the roots grew in the opposite direction away from the force of gravity, it would be classified as negative gravitropism.
Therefore, to properly classify the responses as positive or negative tropisms, you need to identify the specific stimulus that influenced the growth of the mustard seeds in your experiment and then determine whether the growth was towards or away from that stimulus.