Q. No.Evolution of life shows that life forms had a trend of moving from:
1. land to water
2. dryland to wet land
3. fresh water to sea water
4. water to land
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Viviparity is considered to be more evolved because:
1. the young ones are left on their own
2. the young ones are protected by a thick shell
3. the young ones are protected inside the mother's body and are looked after they are born leading to more chances of survival
4. the embryo takes a long time to develop
Which of the following is an example for link species?
1. Lobe fish
2. Dodo bird
3. Sea weed
4. Chimpanzee
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Darwin's in his natural selection Theory did not believe in any role of which one of the following in organic evolution?
1. Parasites and predators as natural enemies
2. Survival of the fittest
3. Struggle for existence
4. Discontinuous variations
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.
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.
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The most likely reason for the development of resistance against pesticides in insects damaging a crop is
1. Genetic recombination
2. directed mutations
3. Acquired heritable changes.
4. Random mutations
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