Quiz_Lichens 1. The source of litmus is : Laminaria Roccella Lecanora Aspergillus Explanation:Litmus is a water-soluble mixture of different dyes extracted from lichens, particularly Roccella species. It is commonly used as a pH indicator in laboratories. 2. Which of the following structures help in retaining moisture? Soredia Cephalodia Syphella Isidia Explanation:Cephalodia are specialized structures in lichens that help retain moisture. They contain cyanobacteria and are often found on the surface of the lichen thallus. 3. Which lichen is called Reindeer moss? Cetraria islandica Cladonia rangiferina Parmelia Lecanora Explanation:Cladonia rangiferina, commonly known as Reindeer moss, is a type of lichen that serves as an important food source for reindeer and caribou in Arctic and sub-Arctic regions. 4. A structure in lichen that is similar to stomata in function is : Isidium Soredium Cynanelle Cyphellae Explanation:Cyphellae are small, pore-like structures found on the lower surface of some lichens. They facilitate gas exchange, similar to the function of stomata in plants. 5. In Gymnocarpeae the fruiting body is : Perithecium Apothecium None of these Cleistothecium Explanation:The apothecium is a type of fruiting body found in certain lichens, particularly those in the Gymnocarpeae group. It is an open, often disc-shaped structure where spores are produced. 6. Helotism word is used for the symbiosis between : Pinus and fungi Algae and fungi Germ and bacteria Algae and Cycas Explanation:Helotism refers to a type of symbiotic relationship where one organism (the fungus) dominates and controls the other (the algae). This relationship is seen in lichens where the fungus provides structure and protection while the algae perform photosynthesis. 7. Lichens show : Commensalism Mycorrhiza relationship Parasitic relationship of algae and fungi Symbiosis of algae and fungi Explanation:Lichens are a classic example of symbiosis, where algae and fungi live together in a mutually beneficial relationship. The algae provide food through photosynthesis, while the fungi offer protection and structure. 8. Elongated structure on upper cortex of lichen, having some algal and fungal partners as in main thallus is : Isidium Soredium Cyphelle Cephalodium Explanation:Isidia are elongated, outgrowths on the surface of lichens that contain both algal and fungal components. They aid in vegetative reproduction and help the lichen spread. 9. Lichens reproduce by : Gonidia Soredia Oidia Conidia Explanation:Soredia are small clusters of algal cells surrounded by fungal filaments. They are a common means of asexual reproduction in lichens, allowing them to disperse and colonize new areas. 10. Lichens are the indicator of pollution : As they grow well in polluted environment As they are sensitive to pollution None of the above As they cause pollution Explanation:Lichens are sensitive to various pollutants, especially sulfur dioxide. Their presence or absence in an area can indicate the level of air pollution, making them valuable bioindicators. Loading …
