The correct sequence of words to fill up the blanks in the given paragraph is D (i) Algae, (ii) Fungus, (iii) Symbiotic, (iv) SO2.

Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus and an algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruit bodies. Algae or cyanobacteria are filled with chlorophyll and make food for the fungus by photosynthesis.

The relationship between the fungus and the algae is symbiotic because they benefit from each other. The fungus provides the algae with a protective environment and absorbs water and minerals from the environment. In return, the algae provide the fungus with food produced through photosynthesis.

Lichens are very sensitive to sulfur dioxide (SO2) pollution in the air. They absorb water and minerals from the air and rain around them, so they also absorb pollutants from the air. When the levels of sulfur dioxide are high in the air, lichens may not be able to survive. Therefore, the presence or absence of lichens can be used as an indicator of air pollution.

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The correct sequence of words to fill up the blanks in the given paragraph is D (i) Algae, (ii) Fungus, (iii) Symbiotic, (iv) SO2.

Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus and an algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruit bodies. Algae or cyanobacteria are filled with chlorophyll and make food for the fungus by photosynthesis.

The relationship between the fungus and the algae is symbiotic because they benefit from each other. The fungus provides the algae with a protective environment and absorbs water and minerals from the environment. In return, the algae provide the fungus with food produced through photosynthesis.

Lichens are very sensitive to sulfur dioxide (SO2) pollution in the air. They absorb water and minerals from the air and rain around them, so they also absorb pollutants from the air. When the levels of sulfur dioxide are high in the air, lichens may not be able to survive. Therefore, the presence or absence of lichens can be used as an indicator of air pollution.

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The correct sequence of words to fill up the blanks in the given paragraph is D (i) Algae, (ii) Fungus, (iii) Symbiotic, (iv) SO2.

Lichens are a complex life form that is a symbiotic partnership of two separate organisms, a fungus and an algae. The dominant partner is the fungus, which gives the lichen the majority of its characteristics, from its thallus shape to its fruit bodies. Algae or cyanobacteria are filled with chlorophyll and make food for the fungus by photosynthesis.

The relationship between the fungus and the algae is symbiotic because they benefit from each other. The fungus provides the algae with a protective environment and absorbs water and minerals from the environment. In return, the algae provide the fungus with food produced through photosynthesis.

Lichens are very sensitive to sulfur dioxide (SO2) pollution in the air. They absorb water and minerals from the air and rain around them, so they also absorb pollutants from the air. When the levels of sulfur dioxide are high in the air, lichens may not be able to survive. Therefore, the presence or absence of lichens can be used as an indicator of air pollution.

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