Which of the following is used as an atmospheric pollution indicator?

1. Lepidoptera  2. Lichens 
3. Lycopersicon 4. Lycopodium
(b) Lichens ca be used an atmospheric pollution indicator. They do not grow in areas that are polluted, as they are sensitve (especially phycobiont) to oxides of nitrogen and sulphur, hence unable to synthesis orgainc food and do not grwo well. 

Lepidoptera lt is insect order.

Lycopersicon lt is scientific name of tomato

Lycopodium kt us an pteridophyte.