Numerical answer
Five sentences related to a topic are given below. Four of them can be put together to form a meaningful and coherent short paragraph. Identify the sentence that does not fit and key in its number as your answer.
1. Lichens are composite organisms formed from a symbiotic partnership between a fungus and a photosynthetic partner, usually an alga or cyanobacterium.
2. The fungal partner provides structure and protection, while the photosynthetic partner supplies sugars produced through photosynthesis.
3. This partnership allows lichens to colonise surfaces, such as bare rock, that neither partner could survive on alone.
4. Mosses, by contrast, are simple non-vascular plants that lack this dual-organism structure entirely.
5. Because of this resilience, lichens are often among the first organisms to establish themselves in newly exposed or disturbed terrain.
1. Lichens are composite organisms formed from a symbiotic partnership between a fungus and a photosynthetic partner, usually an alga or cyanobacterium.
2. The fungal partner provides structure and protection, while the photosynthetic partner supplies sugars produced through photosynthesis.
3. This partnership allows lichens to colonise surfaces, such as bare rock, that neither partner could survive on alone.
4. Mosses, by contrast, are simple non-vascular plants that lack this dual-organism structure entirely.
5. Because of this resilience, lichens are often among the first organisms to establish themselves in newly exposed or disturbed terrain.
Show answer and solution
Answer: 4
Sentences 1, 2, 3 and 5 form a tight, logically sequenced explanation of lichen biology: what a lichen is (1), how the partnership functions (2), what this enables (3), and the resulting ecological role (5). Sentence 4 introduces mosses as a contrasting organism — a tangent that does not belong to this focused account of lichen partnership and resilience, making it the odd one out.
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