Chemicals Needed For Experiments 64b5s

Chemicals needed for experiments 1. Sodium hydrogen carbonate When sodium hydrogen carbonate dissolves in water , it supplies the water with carbon dioxide. NaHCO3

-------------- NaOH +co2

It is used as source of co2 for photosynthesis. 2. NOTE. The combination of sodium hydroxide and pyrogallic acid (sodium pyrogallate) absorbs oxygen and carbon dioxide from the atmosphere. Sodium hydroxide absorbs only carbon dioxide Sodium pyrogallate is needed to prove that o2 is originating from experiment not from any other reason. It is also used to prove that o2 is needed for germination. 3. Iodine solution for starch test .in the presence pof starch turn natural brown color of iodine solution to blue black color. 4.

a solutions of methylene blue or potassium permanganate will

5. Lime water: co2 can turn lime water milky.thats why it is used in some experiment.

2 Lime water going milky is evidence of the presence of carbon dioxide. Respiration involves the breaking down of carbohydrates to carbon dioxide. The production of carbon dioxide thus s the contention that respiration is taking place.

3 If a simple chemical reaction was producing carbon dioxide it should be produced in tube B as well as in tube A, assuming that the chemicals in yeast had not been decomposed by temperatures as low as 100 °C.

Feature Seed Leaves Root

Monocotyledons Seed containing one cotyledon Leaves containing parallel veins Fibrous root system (adventitious)

Graph plotting

Dicotyledons Seed containing two cotyledons Leaves containing branched veins Tap root system with lateral

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Draw a line graph unless there is a good reason for doing otherwise(i.e. not bar charts, histograms)

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Identify the independent variable-the one that is changed or manipulated.

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Identify the dependant varaible-the one that is measured-on which the readings are made.

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use a sharp 2B or HB pencil

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Horizontal(X) axis should show the Independant variable

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Vertical(y) axis should show the dependant variable-the readings made

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use a simple scale

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Fill at least 2/3 or 1/2 the graph paper, but don't spill off the edges.

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label the graph(eg. The temperature on rate of reaction or Graph of rate of reaction(y-axis) against time(x-axis)

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label the axes and give the units(based on the table of data)

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Ringed dots or crosses to plot the points

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If the shape of the curve is not very clear, then draw a line of curve of best fit.

1.

if there is a relationship between the variables, draw a line of best fit/curve

2.

If you are not sure of the relationship between the variables and you do not need to extrapolate, then the successive points with straight ruled lines.

3.

if you need to extrapolate or read the values from the graph, you should draw a line of best fit/curve

Otherwise, draw the dots accurately with ruled straight lines.

Bananas reproduce by suckers, not from seed. They cannot disperse themselves, so the "natural method" of dispersal would be by humans taking them from one place and planting them in another. Bananas do spread a bit from their base, but without proper attention in keeping weeds and jungle down and hacking out old "trunks" they get swallowed up or degenerate. Recent guests of ours from Malaysia insisted the plaintain variety grows wild and uncultivated there. Perhaps this is true, but we doubt it; these were city folk.