GED Science Practice

What is the characteristic feature of lichen according to the provided information?

1. Hard and thick lesions

2. Resembling rocks

3. Grouped together in clusters

4. Grow on marine animals

The correct answer is: Hard and thick lesions

Lichen are unique organisms that are formed by a symbiotic relationship between algae and fungus. The characteristic feature of lichen is that they are hard and thick lesions, as mentioned in the question. This distinguishes them from other organisms in the natural world. Option B, resembling rocks, may seem like a possible answer as lichen can have a rock-like appearance, but this is not their defining characteristic. Option C, grouped together in clusters, may also seem like a possible answer, but this is a common feature of many organisms and does not specifically apply to lichen. Option D, grow on marine animals, is incorrect as lichen generally grow on surfaces such as rocks, tree bark, and soil, not on marine animals. Therefore, the correct answer is A, hard and thick lesions, which accurately describes the characteristic feature of lichen.