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2brpJ
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last edited
by johnlittlephysics 14 years, 4 months ago
BRP Project discussion
- Group J: Jeanette, Carmen, Chrystel Ng
- First hypothesis: If the type of water used to water plants in affects its growth, which kind of water will cause it to grow the healthiest?
- Revised hypothesis: If the rate of increase in height of the green bean plants is related to the type of water used to water the plants, then mineral water will produce the greatest rate of increase in height.
- Draft proposal form:
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Comments (8)
johnlittlephysics said
at 8:11 pm on Jul 3, 2011
Hypothesis feedback:
- we normally do not use different types of water. Also nutrients may already be added directly via fertilizer, or through the soil.
- "healthiest" is not so easily determined or compared.
- Would like your team to resubmit a hypothesis with clearer independent and dependent variables.
Wei Ai Chrystel Ng said
at 11:05 am on Jul 11, 2011
Hi
Wei Ai Chrystel Ng said
at 11:06 am on Jul 11, 2011
Hi Mr Ang, here is my group's edited hypothesis. Sorry for the double post on the main page and the previous comment, my keyboard kind of messed itself up.
Edited hypothesis: If the height of the plants is related to the type of water used to water the plants, then different types of water used will affect the height of the plants.
johnlittlephysics said
at 1:13 pm on Jul 11, 2011
The independent variable may be modified to indicate a "rate of change", e.g. rate of increase in height (showing rate of growth - length per unit time).
The 2nd half of the sentence is supposed to indicate which "type" of water will produce the "greatest rate of increase in height".
johnlittlephysics said
at 11:19 pm on Jul 12, 2011
Feedback on project proposal:
1. For the types of water, ensure that the source or method of collection is consistent and record the details in case more water of a type is needed. E.g, same brand of mineral water, same part of the pond, from same tap, etc.
2. "Water with salt" - is this an artificial concoction, any reason for this?
3. May consider alternative recycled water, e.g. from washing of rice, if available regularly.
4. In the limitations, it is mentioned there may be too few measurements over 3 weeks if measured once per week. Can measure twice per week to get more data.
- Start early, keep good records of every part of expt (including photos, and plants that may not grow well or discarded halfway). These are also valuable observations for discussion.
johnlittlephysics said
at 8:55 pm on Aug 22, 2011
Feedback on draft report:
1. Can you show pictures of the plants at different stages of growth?
2. Do you have more than 1 plant under same conditions - to take average?
3. Water with salt - do you try to grow another plant again, as that single plant that died may be unhealthy for some reason, coincidental?
4. The last column in the table "average increase in height" is not meaningful. May calculate say average increase in height per day = maximum height / no. of days , for more meaningful comparison/analysis.
5. Can attempt to explain differences between the different cases.
Make use of my questions to enhance your report in any way.
The Walking Chocolate said
at 1:02 pm on Aug 31, 2011
Hi mr ang, could you kindly explain point 4? I thought you have to find average increase in height cos there are 4 seeds per type of water?
johnlittlephysics said
at 10:02 pm on Aug 31, 2011
1. Your heights were increasing, and measured at different day intervals, over 7 days, 3 days, 1 day etc.
A suitable average increase in height could be = final height/total no. of days
- compare over equal no. of days.
2. You mention there are 4 seeds, but the table only shows 1 seed per type of water? All raw data collected must be shown, before average is calculated.
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