Evolution

Which of the following is the correct sequence of events in the origin of life ? I. Formation of protobionts II. Synthesis of organic monomers III. Synthesis of organic polymers IV. Formation of DNA-based genetic systems

1. II, III, I, IV
2. II, III, IV, I
3. I, II, III, IV
4. I, III, II, IV

According to Darwin, the organic evolution is due to -

1. Reduced feeding efficiency in one species due to the presence of interfering species
2. Competition within closely related species
3. Intraspecific competition
4. Interspecific competition

The tendency of population to remain in genetic equilibrium may be disturbed by :

1. lack of random mating
2. random mating
3. lack of migration
4. lack of mutations

Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as :

1. Genetic drift
2. Genetic load
3. Genetic flow
4. Random mating

The process by which organisms with different evolutionary history evolve similar phenotypic adaptations in response to a common environmental challenge is called :

1. Convergent evolution
2. Adaptive radiation
3. Natural selection
4. Non-random evolution

The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of :

1. Homologous organs that have evolved due to divergent evolution
2. Analogous organs that have evolved due to convergent evolution
3. Homologous organs that have evolved due to convergent evolution
4. Analogous organs that have evolved due to divergent evolution

Random unidirectional change in allele frequencies that occurs by chance in all populations and especially in small populations is known as :-

1. Genetic drift
2. Migration
3. Mutation
4. Natural selection

Genetic variation in a population arises due to :

1. Reproductive isolation and selection
2. Mutations only
3. Mutations as well as recombination
4. Recombination only

Dinosaurs dominated the World in which of the following geological era ?

1. Jurassic
2. Devonian
3. Coenozoic
4. Mesozoic

The finch species of Galapagos Islands are grouped according to their food sources. Which of the following is not a finch food ?

1. Insects
2. Carrion
3. Tree buds
4. Seeds