Lab 27 Experiment 1 – Effect of pH on Radish Seed Germination

Lab 27 Experiment 1 – Effect of pH on Radish Seed Germination

WEEK 8 EXPERIMENT ANSWER SHEET
Please submit to the Week 8 Experiment dropbox no later than Sunday midnight.

SUMMARY OF ACTIVITIES FOR WEEK 8 EXPERIMENT ASSIGNMENT

• Lab 27 Experiment 1– Effect of pH on Radish Seed Germination

Lab 27 Experiment 1: Effect of pH on Radish Seed Germination

Read through the instructions for the Lab 27 Experiment 1 to complete the table below and answer the following questions. Start the Experiment immediately in order to allow enough time to complete!

Table 1: Radish Seed Observation and Germination

Solution	pH	Days 1-2
Observations	Seeds Germinated	%
Water
Vinegar
Baking soda

Solution	pH	Day 3
Observations	Seeds Germinated	%
Water
Vinegar
Baking soda

Solution	pH	Day 4
Observations	Seeds Germinated	%
Water
Vinegar
Baking soda

Solution	pH	Day 5
Observations	Seeds Germinated	%
Water
Vinegar
Baking soda

Solution	pH	Day 6
Observations	Seeds Germinated	%
Water
Vinegar
Baking soda

Solution	pH	Day 7
Observations	Seeds Germinated	%
Water
Vinegar
Baking soda

Record individual sprout lengths in the table below and then calculate the average sprout length for each treatment.

Solution	pH	Day 7
Individual Sprout Lengths (mm)*	Average Sprout Length
Water		1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Vinegar		1. 2. 3. 4. 5. 6. 7. 8. 9. 10.
Baking soda		1. 2. 3. 4. 5. 6. 7. 8. 9. 10.

* Note that NOT all of your sprouts may germinate!

Data Summary

Solution	pH	% Seeds Germinated	Average Sprout length (mm)
Water
Vinegar
Baking soda

Prepare a bar graph of average sprout length after 7 days of growth for radish seeds exposed to different pH values and insert here. Pay special attention to what each axis represents (independent and dependent variables). Paste graph below (8 pts):

Questions

1. Was there any noticeable effect on the germination rate of the radish seeds as a result of the pH? Compare and contrast the growth rate for the control with the alkaline and acidic solutions.
   
   
   
   
   
2. According to your results, would you say that the radish has a broad pH tolerance? Why or why not? Use your data to support your answer.
   
   
   

1. Knowing that acid rain has a pH of 2-3 would you conclude that crop species with a narrow soil pH range are in trouble? Is acid rain a problem for all plant species? Be sure to cite any source(s) used.

Week 8 Experiment Grading Rubric

Component	Expectation	Points
Lab 27 Exp 1 Data Tables	Results supplied	3 pts
Lab 27 Exp 1 Graph	Graph done correct with all labels	4 pts
Lab 27 Exp 1Question 1	Answers correctly given	3 pts
Lab 27 Exp 1Question 2	Answered correctly and adequately	3 pts
Lab 27 Exp 1Question 3	Answered correctly and adequately	3 pts
TOTAL		16 pts