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- c) In which container did the cress plants have the greatest number of leaves?
- d) What happened to the appearance of the cress plants as the number of seeds in a container was increased?
- e) Account for your observations when cress and lettuce seeds were planted together.
- In the next part of this activity you will determine which plant species has an advantage under certain conditions. Each research group within the class can study a different set of variables.
- Part B: Competition under Different Conditions
- 1. In this part of the activity you will once again use the bases of milk containers with moist potting soil to plant your seeds.
- 2. Plant seeds from various species according to the instructions on the packets. As a class, decide how you will control the mix of seeds in each container.
- 3. Water each of the milk cartons with the same amount of water every second day.
- a) Record the amount of water used.
- 4. Once seeds start to germinate, store each of the milk cartons in a different environment. You might want to use temperature, amount of light, or amount of water as variables. Measure the growth of each of the plants daily.
- a) Does one type of plant begin to dominate the community? Is it
the same type of plant in all containers?
- b) Present your data and draw a conclusion.
- c) Speculate about why one plant might be better adapted for a specific environment.
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