A) Cambrian \[\to\] Ordovician \[\to\] Silurian \[\to\] Devonian \[\to\] Carboniferous \[\to\] Permian
B) Cambrian \[\to\] Devonian \[\to\] Ordovician \[\to\] Silurian \[\to\] Carboniferous \[\to\] Permian
C) Cambrian \[\to\] Ordovician \[\to\] Devonian \[\to\] Silurian \[\to\] Carboniferous \[\to\] Permian
D) Silurian \[\to\] Devonian \[\to\] Cambrian \[\to\] Ordovician \[\to\] Permian \[\to\] Carboniferous
Correct Answer: A
Solution :
Palaeozoic era: (i) Cambrian: Origin of most invertebrate phyla; diverse algae. (ii) Ordovician: First vertebrates (jawless fishes), marine algae abundant. (iii) Silurian: Diversity of jawless vertebrates; colonization of land by plants and arthropods; origin of vascular plants. (iv) Devonian: Diversification of bony fishes; first amphibians and insects. (v) Carboniferous: Extensive forests of vascular plants; first seed plants; origin of reptiles; amphibians dominant. (vi) Permian: Radiation of reptiles, origins of mammal-like reptiles and most modem orders of insects; extinction of many marine invertebrates.
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