A field receives 2000000 kJ of sunlight 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.
A field receives of sunlight in each square metre in a year. Take the PAR as of it, which is the upper limit that NCERT gives. The plants capture to of the PAR.
- How much PAR falls on the field?
- What is the most energy that the plants can capture?
- What is the least energy that the plants capture?
- What per cent of the incident sunlight is the largest capture?
Need a reminder? The key ideaShow
The Sun is the only source of energy for ecosystems, except the deep sea hydrothermal ones. Less than of the sunlight is PAR, and plants capture to of the PAR. The flow of energy is one way. Only about of the energy passes from one trophic level to the next.
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. Sunlight . PAR . Capture to of the PAR.
Plan. Take the PAR first. Then take the share of the PAR.
Step 1. (a) .
Step 2. (b) .
Step 3. (c) .
Step 4. (d) .
Answer: ; ; ; .
Check. The plants hold at most one twentieth of the sunlight. NCERT says that PAR is less than , so the real figures are lower.
Watch out. The to is a share of the PAR, not of all the sunlight.
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