| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.SL.TZ2.19 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 2 |
| Command term | Identify | Question number | 19 | Adapted from | N/A |
Question
The following statements refer to a pyramid of energy.
I. Some material is not assimilated by each trophic level.
II. Energy transformations are never 100 % efficient.
III. Heat is lost during photosynthesis.
Which of the statements give the reason why a pyramid of energy is narrower at the top than at the bottom?
A. I only
B. I and II only
C. II and III only
D. I, II and III
Markscheme
B
Examiners report
Some candidates wrongly believed that the process of photosynthesis produces heat.
