Q. No.Industrial melanism is an example of
1. drug resistance
2. darkening of skin due to smoke from industries
3. protective resemblance with the surroundings
4. defensive adaptation of skin against ultraviolet radiations.
1. drug resistance
2. darkening of skin due to smoke from industries
3. protective resemblance with the surroundings
4. defensive adaptation of skin against ultraviolet radiations.
Which one of the following correctly describes the homologous structures?
1. Organs with anatomical similarities, but performing different functions.
2, Organs with anatomical dissimilarities, but performing same functions.
3. Organs that have no functions now, but had an important function in ancestors.
4. Organs appearing only in embryonic stage and disappearing later in the adult.
Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?
| 1. | Overproduction, variations, constancy of population size, natural selection |
| 2. | Variations, constancy of population size, overproduction, natural selection |
| 3. | Overproduction, constancy of population size, variations, natural selections |
| 4. | Variations, natural selection, overproduction, constancy of population size |
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If a random mating population is in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner?
1. Mutations
2. Random drift
3. Selection
4. Migration
Random genetic drift in a population probably results from
1. highly genetically variable individuals.
2. inbreeding within this population
3. constant low mutation rate
4. large population size
In recent years, DNA sequences (nucleotide sequence) of mtDNA and Y chromosomes were considered for the study of human evolution, because
1. they are small, and therefore, easy to study
2. they are uniparental in origin and do not take part in recombination
3. their structure is known in greater detail.
4. they can be studied from the samples of fossil remains.
According to Oparin, which one of the following was not present in the primitive atmosphere of the earth?
| 1. | Oxygen | 2. | Hydrogen |
| 3. | Water vapour | 4. | Methane |
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The age of fossils in the past was generally determined by the radiocarbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms include:
| 1. | study of the conditions of fossilization. |
| 2. | electron spin resonance (ESR) and fossil DNA. |
| 3. | study of carbohydrates/proteins in rocks. |
| 4. | study of carbohydrates/proteins in fossils. |
Presence of the gills in the tadpole of a frog indicates that:
1. fishes evolved from frog-like ancestors
2. frogs will have gills in future
3. frogs evolved from gilled ancestors
4. fishes were amphibious in the past
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