P2Exam - Sci-Bono Discovery Centre
P2Exam - Sci-Bono Discovery Centre
P2Exam - Sci-Bono Discovery Centre
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Life <strong>Sci</strong>ences/P2 6 DBE/November 2010<br />
NSC<br />
1.5 The diagram below represents a geological timescale with the distribution of<br />
different organisms. The time axis is NOT drawn to scale.<br />
Flowering plants<br />
Vascular plants<br />
Birds<br />
Mammals<br />
Dinosaurs<br />
Reptiles<br />
Amphibians<br />
Bony fish<br />
Multicellular<br />
organisms<br />
Green algae<br />
Photosynthetic<br />
bacteria<br />
Anaerobic<br />
bacteria<br />
Million<br />
years ago<br />
4500<br />
700<br />
570<br />
500<br />
430<br />
400<br />
350<br />
270<br />
230<br />
180<br />
135<br />
65<br />
1.5<br />
Period<br />
Archaeozoic<br />
Cambrian<br />
Ordovician<br />
Silurian<br />
Devonian<br />
Carboniferous<br />
Permian<br />
Triassic<br />
Jurassic<br />
Cretaceous<br />
Tertiary<br />
Quaternary<br />
Era Pre-Cambrian Palaeozoic Mesozoic Cenozoic<br />
1.5.1<br />
1.5.2<br />
1.5.3<br />
1.5.4<br />
How many million years ago did the mammals first appear?<br />
In which era did the flowering plants first appear?<br />
How many years ago did the dinosaurs become extinct?<br />
Give ONE reason why anaerobic bacteria appeared before<br />
photosynthetic bacteria.<br />
(1)<br />
(1)<br />
(2)<br />
(2)<br />
(6)<br />
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