The control and variable in my science project? please help! My experiment is on, Do roots always grow down?

please help i need to know what the control and variable are. im confused and its due monday. PLEASE PLEASE help. and for my starting on explaining my experiment, this is what i have so far tell me what you think. please and thankyou.





In our expermiment on geotropism my partner and I will need 4 lima beans from a seed packet, super glue, a sponge,zipper plastic bag, scissors, a turkey baster, a thumbtack, water, and lastly, a permanent marker. For our hypothisis, my partner and I, will use permenent marker to label the bag as if a clock, 3,6,9, and 12. Next, we cut several tiny slits in the sipper bag using the scissors. Then, we will moisten the sponge, in which we sucured four beans to with each hilium facing correctly, into the zipper bag, afterwards, zip the bag. Following that use the tack to sucure the bag to the wall. Next, make a daily observationfor a continuos five days using the chart that was provided. Finally, water the seeds daily, using the baster to drop water through the small slits in the bag onto the sponge. The control of this is experiment is the effect of geotropism, in other words, a tropism (as of plant roots) in which gravity is the orienting factor and in the word geotropism i a ';tropism'; is a plant movement triggered by stimuli. The term ';geotropic'; refers to a plant whose roots grow down into the soil as a response to gravity. Plants commonly exist in a state of ';anisotropic growth,'; where roots grow downward and shoots grow upward. Anisotropic growth will continue even as a plant is turned sideways or upside down. In other words, no matter what you do to a plant within Earth's atmosphere, it will still grow roots down, stem up. The reason for this comes from the nature of a plant, and it's general response to gravity.Plant growth related to gravity, and plant growth or movement in response to gravity. Upward growth of plant parts, against gravity, is called negative geotropism, and downward growth of roots, positive geotropism. This is some information on our science project.











PLEASE help i dont understand.The control and variable in my science project? please help! My experiment is on, Do roots always grow down?
The seed you orient with the root already pointing 鈥榙own鈥?is your control seed to compare the other seed's growth to. It is aligned with gravity so should grow with no change in direction. All the other seeds have their root tip pointing away from this position. If all the seeds begin to grow out then turn to grow as the control seed they are responding to the directional alignment gravity is providing. You can measure how much they have to bend to do this.


The independent variable is the scar position; the dependent variable is the amount of bend to align with gravity the other roots have to go through.


The root emerges either pointing away from the seed coat scar or pointing the same way as the scar depending on the seed you are using. You need to know what your seed does! What is the correct position? Is the seed scar facing out of the clock or inwards to the center.


Define your words like hilium. The radicle and micropyle are other terms you can look up and use.


Here are labeled pictures to help.


http://www.wastatelaser.org/_support/too鈥?/a>


http://www.mbgnet.net/bioplants/grow.htm鈥?/a>





I reworded your paragraphs a bit......


The purpose of this is experiment is to look at the effect of geotropism on plant growth. Hypothesis is that roots will respond to gravity even if the original orientation of the seed scar is misaligned in respect to the earth鈥檚 center. In other words the seeds roots will emerge and turn down from any position in the soil, if their other needs for germination %26amp; growth are met, they do not have to be correctly aligned. We will test this by pre-positioning the seed scars in a range of orientations with respect to gravity and see if all respond similarly, by growing roots down, despite the seed scar orientation. They will be compared to the control seed placed in alignment with gravity that should show no root bending.





This is some background information on our science project.: A tropism for a plant is a non-reversible, directional response to external stimuli. Geotropism is where gravity is the orienting factor. The term ';geotropic'; refers to a plant whose roots grow down into the soil as a response to gravity. Plants commonly exist in a state of ';anisotropic growth,'; where roots grow downward and shoots grow upward. Anisotropic growth will continue even as a plant is turned sideways or upside down. In other words, no matter what you do to a plant within Earth's atmosphere, it will still grow roots down, stem up. The reason for this comes from the nature of a plant, and it's general response to gravity. Plant growth related to gravity, and plant growth or movement in response to gravity. Upward growth of plant parts, against gravity, is called negative geotropism, and downward growth of roots, positive geotropism.


[Whether this is a quote or reference you have taken you need to site your source of information.]





Methods %26amp; materials section:


In our expermiment on geotropism my partner and I will need 4 lima beans from a seed packet, super glue, a sponge,zipper plastic bag, scissors, a turkey baster, a thumbtack, water, and lastly, a permanent marker.





My partner and I, will use permanent marker to label the bag as if a clock, 3,6,9, and 12. Next, we cut several tiny slits in the sipper bag using the scissors. Then, we will moisten the sponge, in which we secured four beans to with each hilium facing correctly, into the zipper bag, afterward, zip the bag. Following that use the tack to secure the bag to the wall. Next, make a daily observation for a continuous five days using the chart that was provided. Finally, water the seeds daily, using the baster to drop water through the small slits in the bag onto the sponge.





I corrected some of your spelling as well as editing the content of your work so you need to read over what you have and put it back into your own words, if you use any of this.The control and variable in my science project? please help! My experiment is on, Do roots always grow down?
well...i am not able to understand what is the aim of your experiment or is it studying geotropism?





well...in my class, we have started with plant hormones, and have just covered auxins..have not even started with cytokinins..but from what all i've covered,..guess i can say that you do one thing..you cut the plumule to varing degree or make some incision etc. and then see the effect of gravity on the roots. roots come because of the action of auxins and auxin shows polarity and moves downwards because of the action of gravity...





hope this thing helps you somewhere.





and yes, roots always grow downwards.
I think Sam is right. You want to have two treatments: 1) bean face up and 2) bean face down. These two treatments (bean position) will be your variables. Everything else will be controlled. Set these up exactly the same, following your directions but change which way the bean faces (see link to see where the bean hypocotyl (young stem) and radicle (young root) will emerge. They will emerge from a similar place on the bean). To test your hypothesis that the root will always grow down and the stem will always grow up, you will record the measurements on your sheet. If, in both treatments, the root grows down and the stem grows up, you will have some evidence that supports your hypothesis. If in your ';seed faced down'; treatment you have both the stem and root grow down, OR in your ';seed faced up'; treatment you see both the stem and root grow up you have evidence to reject your hypothesis.





Hope that helps and good luck!
Based on your description, it is hard to tell what you are changing and what you are not, which is how you determine ';controls'; (that which is the same in every situation) and ';variables'; (the one thing that you do change).





Since you are using only lima beans, you are controlling the type of seed. You are also going to water them the same amount and at the same time, so the water amount and schedule is under control. I assume they will all be in the same location for sunlight exposure, right? Anything that is the same for all of your seeds is a ';control.';





Now, what are you varying? Generally, with geotropism experiments, you turn the seeds at various points during the growth period to see if the roots will re-orient themselves and seek the ';downward'; direction. Based on your description of marking the bag like a clock face and your comment that each hilium will be ';facing correctly,'; I'm guessing that the variable will be the starting position for the seeds. That would give you a clear difference in the set-up of your four seeds and, therefore, your variable. You are varying the position in which the seed is planted.





You are trying to determine that, no matter what position a seed is in when first planted, it will always grow with roots down and sprout upward. Correct?