Seed Germination Gizmo | ExploreLearning

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Michal Kreiselman

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Seed Germination

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Perform experiments with several seed types to see what conditions yield the highest germination (sprouting) rate. Three different types of seeds can be studied, and the temperature, water and light in the germination chamber can be controlled. No two trials will have the same result so repeated trials are recommended.

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Assessment Questions (5):

Based on the graph below, during which day did the most seeds sprout?
- A. first day
- B. second day
- C. third day
- D. fourth day
Germination experiments for a single seed type were run under four different conditions. The graphs below show the results of each experiment. Which graph represents the experiment that had the most optimal conditions for that type of seed?
- A. Graph A
- B. Graph B
- C. Graph C
- D. Graph D
Imagine that you know the ideal germination conditions for a new seed type, and the percentage of sprouts expected under these conditions. Which of the following statements will be true?
- A. The same number of sprouts will result every time you grow seeds under their ideal conditions.
- B. A different number of sprouts will result every time you grow seeds under their ideal conditions.
- C. The maximum number of sprouts possible for this type of seed will result every time you grow seeds under their ideal conditions.
- D. The percentage of sprouts expected will be a good estimate of the number of seeds that will actually sprout under ideal conditions.
You are a farmer whose farmland is cool, moist, and shady. (Assume that these growing conditions are equivalent to 80 drops/hr of water, 10% light, and a temperature of 13°C in the Gizmo.) You are thinking about planting seeds like Seed A in the Gizmo. You will turn a profit if at least 50% of your seeds become sprouts. Are you most likely to make money or lose money on this crop?
- A. Lose money
- B. Make money
- C. Break even (you won't make money or lose money)
- D. You have a 50% chance of making money, and a 50% chance of losing money
You are given a new type of seed (Seed D). Which method do you think would be the best for finding the ideal conditions for sprouting seeds of type D?
- A. Use random values for the amount of water supplied to the seeds, the amount of light they receive, and the room temperature. Record the number of sprouts that result. Choose new random values and keep trying until you get a very high number of sprouts.
- B. Adjust the amount of water supplied to the seeds through a range of values until you find the amount that results in the highest number of sprouts. Repeat this process for the amount of light supplied, and then the room temperature. Adjust the settings to the best values for each variable, and then make small changes to each variable one at a time to see if the results improve.
- C. Try different values for amount of water supplied, but do not vary the amount of light supplied or the room temperature, since these variables have no effect on germination.
- D. Make an educated guess at the ideal conditions based on things you have measured before with other types of seeds.

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