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Sagot :
Answer:
He bought a mixture of flower seeds and some potting soil. She put
the same amount of soil into each of 5 plastic cups.
• In the first cup she planted 2 seeds, in the second cup she planted 4
seeds, in the third cup 8 seeds, and in the fourth cup she planted 16
seeds. In the last cup she planted 32 seeds. After 25 days, she
determined which set of plants looked the healthiest.
– Control: soil
– IV: # flower seeds
– DV: plant health
Emman decided to start a new garden in her backyard. He heard that plants compete for space and decided to test the idea.
Objective:
Assess the effects of competition on the growth rate of both vascular and nonvascular plants.
Materials:
Pea Monocultures
POT: A) 2 peas
POT: B) 4 peas
POT: C) 6 peas
POT: D) 8 peas
Maize Monocultures
POT: E) 2 maize
POT: F) 4 maize
POT: G) 6 maize
POT: H) 8 maize
Two Species Pots
POT: I) 2 peas, 6 maize
POT: J) 4 peas, 4 maize
POT: K) 6 peas, 2 maize
Procedure:
- Get 11 pots and some seed for planting
- Now, label each of your 11 pots; include on each label the number of plants of each species, and a group name. These labels represent the target for the number of plants the pots will contain.
- Unfortunately, the germination of seeds is never 100%. To overcome this problem we will overplant, and next week you will remove any extra seedlings that appear. For each pot, plant at least 2 more seeds of each type than the target number.
- Make sure that the seeds are spread evenly in the pot; in the two-species pots, the seeds of the two types should be interspersed. These plants will be taken to the greenhouse, where they will be watered regularly. They'll be brought to the lab next week so that plant numbers can be reduced to the target. The experiment will be completed during the eighth laboratory.
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