Which of these statement/s about lichens is/are ture?
I. Lichens are mutually beneficial symbotic associations.
II. They grow extensively in area with high pollution, hence called as pollution indicators.
III. The phycobiont member, algae, is an autotroph and the mycobiont member, fungi, is a heterotroph.
IV. Fungi help the algae harvest sunlight for photosynthesis.

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Lichens are mutually useful associations between algae and fungi. R : Lichens do not grow in polluted areas.

In the following questions , a statement of assertion (A) is followed by a statement of reason (R). A: Lichens are mutually useful associations between algae and fungi. R : Lichens do not grow in polluted areas.

Make corrections wherever you find mistake in spellings/words in the following paragraph/sentences. (A) Protozoans are generally multinucleate, but all ciliates and many amoeboid types are uninucleate. (B) Contractile vacuoles are found in almost all terrestrial protozoans for maitenance of carbon concentration of cell body, the phenomenon is known as osmoregulation. Contractile vacuole also helps in reproduction. (C) The protozoan cell body is either naked or surrounded by a rigid pellicle. Cellulose is present in pellicle. Some protozoans secrete shells of various organic compounds as external covers. (D) Ascomycetes are coenocytic as well as multicellular fungi. In the later, mycelium is asceptate. The asexual spores are formed in chains are called zoospores. The spores are formed endogenously, i.e., inside sporangium. (E) Sexual reproduction in Rhizopus is oogamous and the mode of sexual fusion is gametangial contact type. (F) A lichen is structurally organised entity consisting of the permanent association of a fungus and an alga. The fungal component of a lichen is called phycobiont and the algal component is called mycobiont. Both mycobiont and phycobiont are associated in parasitic union in which the fungus is more predominant and alga is subordinate partner.

Which of the following statement/s is/are wrong? I. Drug can be used for generation of biogas, commonly called gobar gas. II. Biofertilisers are organisms that enrich the nutrient quality of the soil. III. Cyanobacteria are heterotrophic microbes widely distributed in aquatic and terrestrial environments. IV. Many members of the genus Glomus form mycorrhiza. V. Biogas produced by microbes is used as a source of energy in urban areas.

Read the given statements about lichens and select the incorrect ones. (i) They represent an example of commensallism. (ii) Algal partner obtains water and mineral salts from the fungus and the fungal partner obtains food prepared by the aiga. (iii) These do not grow in polluted areas. (iv) The mycobiont is usually an Ascomycetes or a Basididiomycetes. (v) The phycobiont is mostly a green alga or a cyanobacterium. (vi) These constitute the pioneer community in case of hydrosere.

Read the given statements about lichens and select the incorrect ones. (i) They represent an example of commensallism. (ii) Algal partner obtains water and mineral salts from the fungus and the fungal partner obtains food prepared by the aiga. (iii) These do not grow in polluted areas. (iv) The mycobiont is usually an Ascomycetes or a Basididiomycetes. (v) The phycobiont is mostly a green alga or a cyanobacterium. (vi) These constitute the pioneer community in case of hydrosere.

Read the given statements about lichens and select the incorrect ones. (i) They represent an example of commensallism. (ii) Algal partner obtains water and mineral salts from the fungus and the fungal partner obtains food prepared by the aiga. (iii) These do not grow in polluted areas. (iv) The mycobiont is usually an Ascomycetes or a Basididiomycetes. (v) The phycobiont is mostly a green alga or a cyanobacterium. (vi) These constitute the pioneer community in case of hydrosere.