Growth and Trophic Responses

Growth and Trophic Responses - Biol 1009 General Biology...

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Biol 1009 General Biology Name: Biol 1009 Lab Exercise 5: Growth and Trophic Responses Instructions: Using complete sentences, respond to the following questions from lab exercise 5 (parts A and B). For more information about each question, see the lab manual. Note that you will need to submit drawings with this report. The best way to do this is to scan your drawings and submit them electronically with your report. If this won’t be possible, please see the Assignment Guidelines page in the course Syllabus for specific instructions on how to submit your drawings. Part A: Growing Region of the Root 1. Include the two full-scale drawings of the root, one prepared just as you marked the root and one prepared after two to three days. 2. How much did the root grow? What was the total growth rate (i.e., how many millimeters per day)? The root grew 27.6 mm which is 4.6 mm day for 6 days. 3. What portion of the root grew the most? The radicle or the root grew the fastest. The root hair that came from the cotyledon also grew quite quickly but the epicotyl was the slowest to evolve. 4. What other changes occurred in the seedling? What might be the role of gene expression in these changes? The seedlings swelled up a bit in the first few days when the roots began to appear. The epicotyl also emerged a little differently for each seed some were rounder and didn’t look exactly like the image provided in the lab manual. Gene expression in plants determines how a plant grows and 1
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  • Fall '06
  • Weinstein
  • Biology, general biology, petri dishes

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