Multiple Choice QuestionsJurassic period of the Mesozoic era is characterised by
gymnosperms are dominant plants and first birds appear
radiation of reptiles and origin of mammal like reptiles
dinosaurs become extinct and angiosperms appear
dinosaurs become extinct and angiosperms appear
A.
gymnosperms are dominant plants and first birds appear
Jurassic period is the second geological period of Mesozoic era. In this period, the gymnosperms were dominant and the plants included ferns, cycads, Ginkgo, rushes and conifers. Among animals, important invertebrates included ammonites, corals, brachiopods, bivalves and echinoids. Reptiles dominated the vertebrates and the first flying reptiles the pterosaurs appeared.
The first primitive bird, Archaeopteryx, also made its appearance.
A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by
Only daughters
Only sons
Both sons and daughters
Only grandchildren
According to Hugo de Vries, the mechanism of evolution is
Multiple step mutations
Saltation
Minor mutations
Phenotypic variations
Among the following sets of examples for divergent evolution, select the incorrect option :
Forelimbs of man, bat and cheetah
Heart of bat, man and cheetah
Eye of octopus, bat and man
Brain of bat, man and cheetah
The similarity of bone structure in the forelimbs of many vertebrates is an example of
Homology
Analogy
Adaptive radiation
Convergent evolution
The appearance of antibiotic-resistant bacteria is an example of
adaptive radiation
transduction
Pre-existing variation
divergent evolution in the population
Which one of the following graphs correctly describes disruptive selection? When studying fitness level associated with body size?
The most recent and direct pre-historic ancestor is
Cro-magnon
Neanderthal
Pre-neaderthal
None of these
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