Explain the increases in the numbers of melanic(dark winged) moths in the urban areas of post-industrialisation period in England.

In the post-industrialization period in England

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.

How can evolution by natural selection be explained by melanised moths before and after industrialisation in England ?

The total number of industries in a particular portion of the country is approximately 1,600. if the government has decided to increases the number of industries in the area by 20% year. Find the approximate number of industries after 2 years.

Taking an example of white-winged moths and dark-winged moths of England in per and post industrialised era, explain evolution by natural selection .

Assertion :- In England, before industrialisation, it was observed that there were more white-winged moths on trees than dark-winged or melanised moths. Reason :- White winged moths can survive in non industrialised area.

In which areas does the dark melanic species of the peppered moth abound?

A. The conditions primitive on earth (before the origin of life) were : low temperature, volcanic storms, reducing atmosphere containing Ch_(4),NH_(3) , etc. B. Cheetah and humans share similarities in the pattern of bones of forelimbs. C. In a collection of moths made in the 1850s i.e., before industrialization set in, it was observed that there were more dark-winged moths on trees than white-winged moths. D. Branching descent and natural selection are the two key concepts of Darwinian theory of evolution. E. The Neanderthal man with a brain size of 1400 cc lived in east and central Asia 25,000-10,000 years age. Which set of given statements are correct ?

The diagram given below is that of a developing human foetus. Study the diagram and then answer the questions that follow : (i) Label the parts numbered 1 to 3 in the diagram. (ii) Mention any two functions of the part labelled 2 in the diagram. (iii) Explain the significance of the part numbered 3 in the diagram. (iv) Define the term 'Gestation'. What is the normal gestational period of the developing human embryo? (v) Mention the sex chromosomes in a male and female embryo.

Melting and boiling points increase regularly in going across the second period. Explain.