Hello, I'm working my way through some practice Biology questions and I've come across one that has stumped me. I feel like maybe I'm just being a bit dense but could someone take a look at the question and walk me through how I'm supposed to work it out if you know how to do it please?
Question:
Scientists measured the rate of respiration in three parts of an ecosystem. They did this by measuring carbon dioxide released into the air by
• leaves of plants
• stems and roots of plants
• non-photosynthetic soil organisms.
The table below shows the scientists’ results for these three parts of the ecosystem.
Part of
ecosystem Mean rate of carbon dioxide production /cm3 m−2 s−1
Percentage of total carbon dioxide production measured by the scientists
Leaves of
plants
0.032 25.0
Stems and
roots of plants
0.051 ?
Non-
photosynthetic
soil organisms
0.045 ?
(a) Complete the table to show the percentage of total carbon dioxide production by each part of the ecosystem. Show your working.
I know lots of sites give out an answer but I'd like to be able to actually understand it haha.