Biology · Oct / Nov 2019 · Paper 12 · Question 29

A square metre of grassland receives 1 004 000 kJ of sunlight energy per year. The table shows what happens to this energy. process | energy / kJ evaporation of water from the ground | 500 000 absorption by the ground | 330 000 reflection from leaf surfaces | 150 000 formation of new grass leaves | 22 000 metabolism of grass plants (other than growth or respiration) | 1 500 heat loss via grass plant respiration | 500 How much of the 1 004 000 kJ of sunlight energy was used by the grass plants?

1. A500 kJ
2. B2000 kJ
3. C23 500 kJ
4. D24 000 kJ

As printed in the paper