Question 18M.2.SL.TZ2.1d
| Date | May 2018 | Marks available | [Maximum mark: 2] | Reference code | 18M.2.SL.TZ2.1d |
| Level | SL | Paper | 2 | Time zone | TZ2 |
| Command term | Analyse | Question number | d | Adapted from | N/A |
The environmental impact of producing protein from mealworms was compared with the impact of producing traditional protein sources. The graphs show the greenhouse gas production (global warming potential) and land use due to the production of 1 kg of protein from mealworms, chickens and cattle.
Birds and mammals maintain constant body temperature despite considerable losses of body heat to the environment. In insects such as mealworms, body temperature is variable and is often the same as the temperature of the environment or only slightly above it. Analyse the data in the bar charts, using this information.
[2]
a. cell respiration required to generate heat (lost to environment) to maintain body temperature
b. birds/chickens and mammals/cattle carry out cell respiration at higher rate than insects
c. «chickens/cattle therefore» generate more CO2 per kg protein produced
d. «chickens/cattle» need more food/land area to produce body mass
e. feed conversion ratios are lower in mealworms/insects/cold blooded animals as they do not need to maintain a constant body temperature (accept converse)
