In 1953, S. L. Miller created primitive earth conditions in the laboratory and gave experimental evidence for the origin of the first form of life from pre-existing non-living organic molecules. The primitive earth conditions created include:
1. | low temperature, volcanic storms, an atmosphere rich in oxygen |
2. | low temperature, volcanic storms, reducing atmosphere |
3. | high temperature, volcanic storms, non-reducing atmosphere |
4. | high temperature, volcanic storms, reducing atmosphere containing CH4, NH3 etc. |
Which of the following types of natural selection reduces variation but does not change the mean value?
1. | directional | 2. | stabilizing |
3. | disruptive | 4. | all of these |
Which of the following pairs of organs do not represent analogous organs?
1. | Eye of an octopus and the eye of a mammal |
2. | Flippers of penguins and flippers of dolphin |
3. | Wings of bats and forelimbs of humans |
4. | Wings of birds and wings of butterfly |
Plica semilunaris on the inside corner of the eye and, muscles in the pinna are:
1. | analogous structures | 2. | homologous structures |
3. | vestigial structures | 4. | phylogenetic structures |
The wings of birds, the forelegs of a horse, and the upper limbs of humans are:
1. | analogous structures | 2. | homologous structures |
3. | vestigial structures | 4. | phylogenetic structures |
The “Biogenetic Law” was given by :
1. | von Baer | 2. | Ernst Haeckel |
3. | Hugo de Vries | 4. | Theodosius Dobzhansky |
“Organisms that share common descent show underlying embryological patterns on which they build later their adult patterns”. This is :
1. | Haeckel’s law | 2. | Baer’s law |
3. | Gauss law | 4. | Allen’s rule |
Lichens are very sensitive to pollution. In England, after the onset of the industrial revolution, the lichens were adversely affected and the frequency of the dark-colored peppered moths increased because they were:
1. protected from carcinogens
2. protected from lichen poisons
3. more robust
4. protected from predation
The control apparatus of the Urey and Miller experiment was devoid of :
1. a provision for evaporation
2. an arrangement for circulation
3. a source of energy
4. an arrangement for condensation
The type of natural selection that operates to eliminate intermediate phenotypes in a population is known as:
1. | Directional selection | 2. | Disruptive selection |
3. | Stabilizing selection | 4. | Reverse selection |