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Evidences of Evolution
Morphological evidences - definition and differences between homologous and analogous organs (two examples each from plants and animals).
Embryological evidences - theory of recapitulation, definition and differences between ontogeny and phylogeny.
Palaeontological evidence - definition of fossils.
(a) Select the homologous structures from the combinations given below:
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
Find out from newspapers and popular science articles any new fossil discoveries or controversies about evolution.
Try to trace the various components of human evolution (hint: brain size and function, skeletal structure, dietary preference, etc.)
State a reason for the increased population of dark coloured moths coinciding with the loss of lichens (on tree barks) during industrialization period in England.
With the help of any two suitable examples explain the effect of anthropogenic actions on organic evolution.
Write the similarity between the wing of a butterfly and the wing of a bat. What do you infer from the above with reference to evolution?
Differentiate between analogy and homology giving one example each of plant and animal respectively.
Select two pairs from the following which exhibit divergent evolution. Give reasons for your answer.
(i) Forelimbs of cheetah and mammals
(ii) Flippers of dolphins and penguins
(iii) Wings of butterflies and birds
(iv) Forelimbs of whales and mammals