A Level Biology Student Answers
I found that length and width of leaves are greater when light intensity is less (Leaves found in the shade).
So what kind of Statistical test should i use and why
1) Students T-Test
2) Mann Whitney U test
3) Spearman's Rank Correlation Coefficient
and what kind of graph should i do aswell? Scatter diagram or the Box and whisker diagram?
Will i have to do a different table and graph for both Length of leaf and Width of Leaf?
Plz help!! Thanks in advance!
You would have to use Spearman's Rank Correlation Coefficient because your finding out the relation between two variables; dependant and independant. You would use this statistical test to test the strength of the relationship.
I am not sure about the graph but i hope this helps :)
The effect of the heavy metal barium on the growth rate of your plants.
for the above title i have to complete my P-skill for the coursework but i was unsure of what type of scientific information i should include.
not many students seem to have carried out this investigation. if anyone has any information that could help me it would be really appreciated.
i need to know if bakers yeast performs aerobic respiration - and if so, would basic dough rise evenly if sealed in an air tight conatiner (pressed up against the glass).
would appreciate any help or even alternate experiment designs!
In fact,factors affecting yeast respiration are temperature,pH,type and conc. of substrate,concentration of enzyme and inhibitor.
There is a simple experiment that you can carry out.just follow the steps:
Apparatus:1.Boiling tube,2.Thermometer,3.Test tubes,4.A gas delivery tube connected to the rubber bung. 5.stopwatch
Substance required:yeast,Glucose solution.
1.Place 5cm3 of yeast in a boiling tube.Then,add an equal amount of glucose solution.
2.Connect the bung to which a delivery tube is attached to the mouth of the boiling tube.
3.fill about half a test tube with water.place the end of the delivery tube in the water.
4.set a water bath at a specific temperature.place the boiling tube in it.
5.Allow the tube like this for a few minutes to allow the yeast to adapt to its new environment.
6.After a few seconds bubbles would start to out of the delivery tube.
7.Start a stopwatch and count the number of bubbles evolved over 3 mins.
8.Hence,the rate of gas bubbles evolved can be calculated.
For more accuracy,the volume of carbon dioxide evolved can be measured.Variables such as temperature can be varied by changing the temperature of water bath or the substrate conc. can be varied using different conc. of glucose solution.
The above experiment can be used to investigate other variables.Of course.you can improve it.
can anyone help me with a few things:
in a plant cell the -
a) storage of genetic information
b) protein synthesis granules
c) secretory materials
d) structure that controls the movement of materials into and out of the cell
why are lysosomes enclosed within membranes?
Any help will be much appreciated.
a) Nucleus - The largest organelle in the cytoplasm of a eukaryotic cell is usually the nucleus, a structure that directs all the activities of the cell. The nucleus is like a manager who directs everyday business for a company and passes on information to new cells. The nucleus contains genetic blueprints for the operations of the cell.
b & c) Golgi Bodies - In cells, structures called Golgi Bodies are stacks of membrane-covered sacs that package and move proteins to the outside of the cell. Golgi bodies are the packaging and secreting organelles of the cell.
d)Cell Membrane - The cell membrane is a structure that forms the outer boundary of the cell and allows only certain materials to move into and out of the cell. Food, oxygen and water move into the cell through the membrane. Waste products also leave through the membrane.
Should genetically modified food be banned?
Should gene therapy be used as a treat for all genetic diseases?
Hope these help!!
Bile emulsifies the fats, so it will cut them up into smaller globules. This increases the surface area of the fats, so the lipase can have a greater effect.
Therefore, as the concentration of bile increases, the rate of digestion will increase.
You'll be alot i you could help with this question
Explain how the direction o the flow of the blood and the flow of water increases the efficiency of the gill plate as an exchange?
Since water and blood flow in opposite directions a difference in concentration gradient is maintained as an equilbreum is never reached allowing more oxygen to be diffused through the gills.