Let see these past years' questions in the Paper 3:
...explain the relationship between the rate of amylase activity on starch and the pH values of the mixture solution. (SPM 2011)
...explain the relationship between the time of activity and the percentage of CO2 in the air example (SPM 2010)
---explain the relationship between the rate of photosynthesis and the distance from the bulb (SPM 2009)
Most of my students find out that this is one of the most difficult question to answer in Paper 3. Good, difficulties are fun in disguise. As long I'm the one teaching you. Let me give my personal example...
...explain the relationship between cat's cuteness and the cat's level of happiness (3marks)
1. Determine MV & RV
MV - cat's cuteness
RV - cat's happiness
2. Imagine 2 or 3 sequences leading from MV to RV
3. Freaking fill them up! (use theories...)
BOX 1 - receive more attention and love
BOX 2 - given more food
BOX 3 - more playful and healthier
4. Write the complete answer
When the cat is cute (MV), they receive more attention and love from humans (BOX 1). Hence, the cats are given more food regularly (BOX 2). As a result, the cats become more playful and healthier (BOX 3). Ultimately, the cat's level of happiness increases (RV).
As easy as ABC :-)
Now, lets use this technique to apply on the first question (SPM 2011).
1. Determine MV & RV
MV - pH value, RV - rate of amylase activity
2. 3 boxes are identified
Answers recalled from textbook
3. Fill the boxes
BOX 1 - the ions are concentrated oppositely between enzyme & substrate
BOX 2 - the enzyme and substrate easily attracted to each other
BOX 3 - the substrate can easily changed into product in shorter time.
4. Write the goddam answer.
When the pH value increases or more alkaline (MV), the ions are concentrated oppositely between amylase & starch (BOX 1). This causes amylase and starch easily attracted to each other (BOX 2). Hence, starch can be easily changed into maltose in shorter time (BOX 3). Ultimately, this increases the rate of amylase activity (RV).
There you go, a freaking FULL SOLID 3 MARKS for this type of question. Pen down. Listen up. Mind these words - see you later in my seminar.