Evolution

The Jurassic period of the Mesozoic era is characterized by-

1. Radiation of reptiles and origin of mammal-like reptiles
2. Flowering plants and first dinosaurs appear
3. Gymnosperms are dominant plants and first birds appear
4. Dinosaurs become extinct and angiosperms appear

Using imprints from a plate with complete medium and carrying bacterial colonies, you can select streptomycin resistant mutants and prove that such mutations do not originate as adaptation. These imprints need to be used -

1. On plates with minimal medium
2. Only on plates with streptomycin
3. Only on plates without streptomycin
4. On plates with and without streptomycin

Which one of the following experiments suggests that simplest living organisms could not have originated spontaneously from non-living matter?

1. Meat was not spoiled, when heated and kept sealed in a vessel
2. Larvae could appear in decaying organic matter
3. Microbes appeared from unsterilized organic matter
4. Microbes did not appear in stored meat

De Vries gave his mutation theory on organic evolution while working on -

1. Althaea rosea
2. Oenothera lamarckiana
3. Pisum sativum
4. Drosophila melanogaster

There are two opposing views about origin of modern man. According to one view Homo erectus in Asia were the ancestors of modern man. A study of variation of DNA however suggested African origin of modern man. What kind of observation of DNA variation could suggest this?

1. Variation only in Asia and no variation in Africa
2. Similar variation in Africa and Asia
3. Greater variation in Africa than in Asia
4. Greater variation in Asia than in Africa

Which one of the following phenomena supports Darwin's concept of natural selection in organic evolution?

1. Prevalence of pesticide resistant insects
2. Development of organs from 'stem' cells for organ transplantation
3. Production of 'Dolly', the sheep by cloning
4. Development of transgenic animals

Which of the following is the relatively most accurate method for dating of fossils?

1. Radio-carbon method
2. Uranium-lead method
3. Potassium–argon method
4. Electron-spin resonance method

At a particular locus, frequency of 'A' allele is 0.6 and that of 'a' is 0.4. What would be the frequency of heterozygotes in a random mating population at equilibrium?

1. 0.48
2. 0.24
3. 0.36
4. 0.16

Which of the following is not true for a species ?

1. Variations occur among members of a species
2. Gene flow does not occur between the populations of a species
3. Each species is reproductively isolated from every other species
4. Members of a species can interbreed

Diversification in plant life appeared

1. due to long periods of evolutionary changes
2. due to abrupt mutations
3. suddenly on earth
4. by seed dispersal