Found mostly in the terrestrial part of the world, lichens are in fact two entities operating as a single entity which is a stable one. Lichens are the association of a fungus surviving in a symbiotic relationship with an algae. Where the fungal partner is the mycobiont and the non-fungal partner is the phycobiont containing chlorophyll.
1. This is a crustose lichen
(a) Peltigera
(b) Usnea
(c) Rhizocarpon
(d) None of the above
Answer: (c)
2. Most of the scientists deem the algal-fungal relationship in lichens as helotism. Helotism is a
(a) master-master relationship
(b) master-slave relationship
(c) a kind of mutualism
(d) a kind of symbiotic association
Answer: (b)
3. Majorly, lichens are the pollution indicators of
(a) CO
(b) Mercury
(c) NO2
(d) SO2
Answer: (d)
4. The symbiotic association of algae and fungi is known as
(a) Mycorrhiza
(b) lichen
(c) Mycoplasma
(d) Both (a) and (b)
Answer: (b)
5. Vegetative reproduction in lichens takes place by
(a) isidia
(b) soredia
(c) fragmentation
(d) all of the above
Answer: (d)
6. In the studies on the atmospheric pollution, lichens are important as they
(a) can readily multiply in polluted atmosphere
(b) are very sensitive to pollutants
(c) efficiently purify the atmosphere
(d) can also be grown in greatly polluted atmosphere
Answer: (b)
7. This lichen is pioneer in xerosere
(a) fruticose lichen
(b) foliose lichen
(c) crustose lichen
(d) leprose lichen
Answer: (c)
8. A common phycobiont in lichens are
(a) Cetraria
(b) Microcystis
(c) Trebouxia
(d) Oedogonium
Answer: (c)
9. Reindeer moss is a lichen known as
(a) Usnea
(b) Rocella
(c) Cladonia
(d) Parmelia
Answer: (c)
10. This about lichens is incorrect
(a) Lichens are indicators of pollution
(b) They grow rapidly about 2cm every day
(c) Some species are eaten by reindeers
(d) They have symbiotic relationship between alga and fungus
Answer: (b)
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