Which of these gases was/were present in prebiotic atmosphere?

• Ammonia

• Methane

• Oxygen

• Hydrogen

The direct ancestor of the living modern man is

• Homo erechis

• Homo neanderthalensis

• Homo sapiens fossils

• Homo sapiens sapiens

Consider the following statements given below.

I. First living form originated from semi-arid land.

II. Nucleic acid were the first sign of life and represented beginning of life.

III. It was strongly beleived that prokaryotes evolved to from eukaryotes.

Choose the correct option

• I and II

• II and III

• Only III

• I, II and III

Parapatric speciation takes place when

• a small segment of the original population becomes isolated reproductively

• a part of the population becomes geographically isolated from the main population

• a very different daughter species bud off from a semi- isolated peripheral population of ancestral species

• a population of a species enters a new habitat

Evolution of horses occured in

• Holocene epoch

• Miocene epoch

• Palaeocene epoch

• Eocene epoch

Reproductive isolation mechanism prevent interbreeding of naturally sympatric population. Given below are categories of isolating mechanisms. Choose the correct name for isolation when potential mates occupy overlapping ranges but reproduce at different times of the year.

• Ecological isolation

• Behavioural isolation

• Temporal isolation

• Mechanical isolation

Darwin in the 'theory of natural selection' states that

• characters acquired during the life of an individual are inherited by its offsprings

• environment does not play any role in the evolution

• natural selection acts on favourable variations, which appear among individuals of a species

• heritable variations arises through changes in the gene complex of species

338.

The most ancient member of the genus Homo belonged to which of the following species or sub-species?

• Fossilis 

• Sapiens

• Erectus

• Habilis

Select the correct sequence of stages in the evolution of modern man (Homo sapiens)

• Australopithecus, Homo habilis, Neanderthal, Cro-magnon man, Modern man

• Homo habilis, Neanderthal, Australopithecus, Cro-magnon man, Modern man

• Australopithecus, Neanderthal, Cro-magnon man, Homo habilis, Modern man

• Neanderthal, Australopithecus, Cro-magnon man, Homo habilis, Modern man

Which one of the given statement is not true for Archaeopteryx?

• Each wing had three clawed digit

• Hind feet with five digits

• Long jointed lizard like tail

• Thecodont teeth on both jaws