Q3 of 26 Page 284

What are fossils?

Fossil refers to any preserved remains, impressions or trace of dead plants and animals that once lived in the past. The dead bodies of plants and animals are usually decomposed by micro-organisms, but in some cases they do not decompose completely and are preserved. Fossils include bones, shells, impressions on rock, etc.

For example, if a dead leaf is trapped in mud, then mud forms an impression by setting around it as a mould. It then hardens and a fossil is formed.


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2

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Choose the one term from the following which includes the other three: broccoli, wild cabbage, cauliflower, cabbage.

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In what way homologous organs give evidence for evolution?

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Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Give reason for your answer.