MediumBiologyHigh School (11–12)Diversity of Living Organisms › Lichens and SymbiosisDiversity of Living Organisms › Viruses, Viroids and PrionsNumerical
A class counts the lichen species on trees at seven places: temple garden 10, school ground 7…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A class counts the lichen species on trees at seven places: temple garden , school ground , petrol pump , bus depot , lake shore , market and highway bridge . Let or more species mean clean air, to moderate air and fewer than polluted air. How many places are in each group?
Need a reminder? The key ideaShow
A lichen is a symbiotic association of an alga (the phycobiont), which makes food, and a fungus (the mycobiont), which gives shelter and takes in water and minerals. Lichens do not grow in polluted air, so they are pollution indicators.
The worked solution
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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.
Step 1. Clean ( or more). The temple garden () and the lake shore (): places.
Step 2. Moderate ( to ). The school ground () and the market (): places.
Step 3. Polluted (under ). The petrol pump (), the bus depot () and the highway bridge (): places.
Answer: clean, moderate and polluted; .
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