Q 1914223150.     12. In England around 1850s, before industrialisation,
more white winged moths than dark-winged or
melanised moths were observed on trees.
However, after industrialisation, i.e., in 1920 there
were more dark-winged moths in the same area
i.e., the proportion was reversed.

(i) Why were there white moths before
industrialisation?
(ii) Why were there more dark-winged melanic
moths after industrialisation?
(iii) What important phenomenon can be
derived from this observation?
(iv) Define the phenomenon, as answered in part
(iii).
(v) What are your views on the above
situation?

NCERT Value Based 7/12/LAT

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