The plants of a field make 1800 kJ of net primary production in each square metre in a year…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The plants of a field make of net primary production in each square metre in a year. Insects and deer eat of it while the plants are alive. The rest dies and falls to the ground.
- How much energy goes into the grazing food chain, in kJ for each square metre in a year?
- How much goes into the detritus food chain?
- How many times larger is the detritus share than the grazing share?
Need a reminder? The key ideaShow
The grazing food chain starts with a green plant. The detritus food chain starts with dead organic matter. On land, most of the energy goes through the detritus chain. In water, the grazing chain is the major route. Joined chains make a food web.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. for each square metre in a year. is eaten alive.
Plan. Find the grazed part. The detritus part is what is left.
Step 1. (a) .
Step 2. (b) .
Step 3. (c) times.
Answer: ; ; times.
Check. The two parts add to . A terrestrial ecosystem sends most of its energy through the detritus chain, as NCERT says.
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