This is where most students lose easy marks. Follow these "Golden Rules":
For biology 9700, mention:
Submerge reaction vessels in a thermostatically controlled water bath. Evaporation of liquid during heating.
). Ensure points are accurate to within half a small square.
Common subjects include catalase, amylase, or protease. Focus on controlling variables like temperature (using a water bath) and pH (using buffers) while measuring the rate of reaction through gas collection or color changes. 2. Microscopic Observation and Calibration biology 9700 practical notes
Count the number of eyepiece divisions (epu) and stage micrometer divisions between these two points. Calculate the value of 1 epu using the formula:
All readings in a column must be to the same degree of precision. If your stopwatch reads 12.00, don't write "12." Graphing:
"Suggest why the rate decreased after 10 minutes." A: "Substrate depletion, end-product inhibition, or denaturation of enzymes (if temperature/high pH)."
The (Papers 3 and 5) is not just about being good with a microscope; it is about accuracy, speed, and scientific thinking. This is where most students lose easy marks
Let’s break down exactly how to tame this paper.
Actual Size (A)=Image Size (I)Magnification (M)Actual Size (A) equals the fraction with numerator Image Size (I) and denominator Magnification (M) end-fraction
user wants a long article on "biology 9700 practical notes". This is likely for Cambridge International AS & A Level Biology (9700). I need to gather comprehensive information about the practical exam, including paper format, apparatus list, key techniques, planning, recording, drawing, microscopy, statistics, sample practicals, and study tips.
Enzyme practicals usually investigate how factors like temperature, pH, enzyme concentration, or substrate concentration alter the rate of reaction. Quantifying Reaction Rates Focus on controlling variables like temperature (using a
Draw a smooth curve or a straight line through the points. If you are uncertain about the true trend, connect the points sequentially using straight lines drawn with a ruler. 7. Identifying Limitations and Improving Procedures
Include units only within the column headings (e.g., Time / s or Temperature / °C ). Never write units inside the data cells.
The exam loves to ask: "Suggest two limitations in this experiment."
Choose a scale where the plotted data occupies more than half of the grid area. Use simple, easily divisible scale steps (e.g., 1, 2, 5, or 10 units per large grid square). Avoid awkward scales like 3 or 7.