The concept of chemical evolution is based on
1. crystallization of chemicals
2. interaction of water, air, and clay under intense heat
3. effect of solar radiation on chemicals
4. the possible origin of life by the combination of chemicals under suitable environmental conditions
One of the important consequences of geographical isolation is
1. no change in the isolated fauna
2. preventing speciation
3. speciation through reproductive isolation
4. random creation of new species
Which one of the following describes correctly the homologous structures?
1. Organs appearing only in embryonic stage and disappearing later in the adult
2. Organs with anatomical similarities, but performing different functions
3. Organs with anatomical dissimilarities, but performing same functions
4. Organs that have no function now, but had an important function in ancestors
'Continuity of germplasm' theory was given by
1. De Vries
2. Weismann
3. Darwin
4. Lamarck
Which one of the following amino acid was not found to be synthesised in Miller's experiment?
1. Aspartic acid
2. Glutamic acid
3. Alanine
4. Glycine
Two geographical regions separated by high mountains are
1. Oriental and Austrailian
2. Palaearctic and Oriental
3. Nearctic and Palaearctic
4. Neotropical and Ethiopian
Correct order is [1991]
1. Palaeozoic Archaeozoic Coenozoic
2. Archaeozoic Palaeozoic Proterozoic
3. Palaeozoic Mesozoic Coenozoic
4. Mesozoic Archaeozoic Proterozoic
Homologous organs are
1. wings of insects and bat
2. gills of fish and lungs of rabbit
3. pectoral fins of fish and fore limbs of horse
4. wings of grasshopper and crow
Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as
1. adaptive radiation
2. natural selection
3. migration
4. divergent evolution
Which was absent in the atmosphere at the time of origin of life?
1. NH3
2. H2
3. O2
4. CH4