Write an experimental design

[sora4ever1]

Due NO LATER THAN October 1

Write an experimental design based on any graph from the textbook. You may make slight alterations to the graph. Include all pertinent parts to a good design.

On a separate sheet of paper, identify the following from your design: observations, hypothesis, independent variable, dependent variable, control group, experimental group, several constants, concluding statement.

ANY IDEAS IT'S FROM THE 9TH GRADE TEXT BOOK (BIOLOGY: PRINCIPLES & EXPLORATIONS)

COPYRIGHT c 2001 by HOLT, RINEHART AND WISTON
ISBN 0-03-051999-3
1 2 3 4 5 6 7 8 048 05 04 03 02 01 00 99


and this website does not come up it's in my book http://www.scillinks.org/ instead some other website pop up like a search engine.

 

[andrevdh]

A graph indicates the relationship between two variables (sets of measurements in an experiment) describing some phenomena (like the relation between the extension of a spring as a result of an applied force). In the experiment one quantity is changed by the experimenter (the applied force) and the other changes as a result of this (the extension of the spring). In the case of the spring experiment the force is the independent variable (the quantity that the experimenter changed himself), while the extension of the spring is the dependent variable. During the experiment some other quantities that might influence the dependent variable need to be kept constant like for the spring it's temperature should be kept constant (heating it up would result in the spring becomming softer). Go through the graphs in your textbook and see if you can identify the independent and dependent quantities together with some other quantities that could influence the dependent variable (the constants).

 

[quicknote]

Experimental Design:

Title: The Effect of Fertilizer on Plant Growth

Introduction: In this experiment, we will investigate the effects of fertilizer on plant growth. Fertilizer is often used to provide plants with essential nutrients and promote growth. We will measure the height of plants over a period of time to determine if the plants that received fertilizer grew taller than those that did not.

Hypothesis: Plants that receive fertilizer will grow taller than plants that do not receive fertilizer.

Materials:
- 20 identical pots
- Potting soil
- 20 bean seeds
- Fertilizer
- Measuring tape
- Water

Procedure:
1. Fill each pot with potting soil.
2. Plant one bean seed in each pot, following the instructions on the seed packet.
3. Label 10 pots as the experimental group and 10 pots as the control group.
4. Water all pots evenly and place them in a sunny location.
5. For the experimental group, add the recommended amount of fertilizer to each pot once a week.
6. Measure the height of each plant once a week for four weeks and record the data.
7. At the end of the experiment, calculate the average height of the plants in each group.
8. Compare the average heights of the experimental and control groups to determine if there is a significant difference.

Observations: The height of each plant will be measured once a week for four weeks. The data will be recorded in a table.

Hypothesis: Plants that receive fertilizer will grow taller than plants that do not receive fertilizer.

Independent Variable: Fertilizer

Dependent Variable: Plant height

Control Group: The 10 pots labeled as the control group will not receive any fertilizer. This will serve as a baseline for comparison to the experimental group.

Experimental Group: The 10 pots labeled as the experimental group will receive the recommended amount of fertilizer once a week.

Constants: The type and amount of soil, type of plant, amount of water, and location of the pots will be kept constant throughout the experiment.

Concluding statement: Based on our data, we can conclude that the plants that received fertilizer grew taller than those that did not receive fertilizer. This supports our hypothesis that fertilizer can promote plant growth. Further experiments could be conducted to determine the optimal amount of fertilizer for maximum plant growth.