Question 19M.2.SL.TZ2.b
| Date | May 2019 | Marks available | [Maximum mark: 4] | Reference code | 19M.2.SL.TZ2.b |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Outline | Question number | b | Adapted from | N/A |
Outline how photosynthesis produces glucose.
[4]
a. solar/light energy is converted to chemical energy ✔
b. energy needed to produce glucose ✔
c. only specific wavelengths are absorbed by chlorophyll
OR
red and blue absorbed most strongly.
OR
chlorophyll is the pigment that absorbs light energy ✔
d. H(+)/electrons from water are used to reduce compounds ✔
e. CO2 is absorbed/used/reduced to produce carbohydrates ✔
f. correct word/balanced symbol equation of photosynthesis ✔
Accept correct reference to NADPH/ATP from AHL.
Glucose and photosynthesis. Again, this was an example of leaping into an answer without planning. Despite G2 protestations, HL material was not expected. Better candidates were able to gain full marks by stating that the light was trapped by chloroplasts, processes converted this into chemical energy and energy was needed to make glucose and included a correct equation ( if a symbol equation, it needed to be balanced).
