Transcript Choice A
The Man’s PSSA Practice For the bean planter experiment featuring Evan, what most likely was the hypothesis for Evan’s experiment? Choose one of the 4 choices. Choice B- Bean plants will grow better if they are not too close together. Choice A- watered every day (Not correct, he used the same amount of water, it was constant) Choice C- Depth of 1 cm (Not correct, depth was the same for all plants, it was constant) Choice D- Fertilizer (Not correct, no mention of fertilizer) For the bean planter experiment featuring Evan, what was the independent variable? Choose one of the 4 choices. Choice D- Distance between the seeds (it was varied with different distances to see if plants grew taller). Incorrect Answer Choices: Choice A- Type of seed (they were all bean seeds) Choice B- Number of leaves (it’s a dep. Variable) Choice C- Watering frequency was held constant For the bean planter experiment featuring Evan, which planters (not which plants) provide evidence to support Evan’s hypothesis? Choice D- Planters 1 & 4 (They had the greatest spacing between plants and the tallest plant heights) For the bean planter experiment featuring Evan, what other variable could Evan measure to help support his hypothesis? Choice A- Number of beans (since they are bean plants that are close together) Choices B & C (how long it takes to water each planter & the avg. temp. are both constants) Choice D- Vein pattern (who cares?) Variables Pan 1 Pan 2 Pan 3 Pan 4 Temperature -10oC 0oC 15oC 30oC Light conditions kept in darkness kept in bright light kept in darkness kept in bright light A student wanted to study the amount of mold growing on pizza at different temperatures. One error made in setting up the experiment was that the four pans of pizza (1) were at different temperatures (2) were different sizes (3) had different ingredients (4) received different amounts of light A student set up the experiment below to learn about plant growth. Identify one variable that is being held constant in this experiment & Explain why it needs to be held constant. Amount of soil, amount of sunlight, temperature, etc. so they don’t affect the plant growth since the student is ONLY examining the effect of water on plant growth. A farmer grows and sells flowering plants. The best-selling plants are the ones with the most blossoms. The farmer reads an advertisement for a plant food saying that it? will make plants grow faster and taller. The farmer predicts that taller plants will have more blossoms and performs the following experiment to test this hypothesis. Two groups of 10 plants each are grown in identical pots filled with equal amounts of identical soil. The amount of sunlight, the room temperature, and the amount of water are held constant for both groups. Group A is given plant food at regular intervals according to the instructions on the package. Group B is not given plant food. The farmer observes the plants after 15 weeks of growth. State the farmer's original hypothesis. Based on the results of this experiment, is the farmer's original hypothesis correct? Explain your answer. Taller plants will have more blossoms. No, b/c the taller plants with plant food had slightly fewer blossoms (Group A)