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Evolution · Question 92

AIPMT 2004MCQEasy📈 Topic in 12% papers+4−1
1

According to Oparin, which one of the following was not present in the primitive atmosphere of the earth ?

  1. Water vapour
  2. Oxygen
  3. Methane
  4. Hydrogen

Answer

(2) Oxygen

Solution

As per NCERT, Oparin of Russia and Haldane of England proposed that the first form of life could have come from pre-existing non-living organic molecules.

⇒ The conditions on early earth were high temperature, volcanic storms and a reducing atmosphere containing CH4, NH3, H2 and water vapour.

∴ Free oxygen was absent in the primitive atmosphere.

Answer: (2)

AIPMT 2004

Keep practising — Evolution

2

Diversification in plant life appeared

  1. By seed dispersal
  2. Due to abrupt mutations
  3. Due to long periods of evolutionary changes
  4. Suddenly on earth
AIPMT 2004
3

Convergent evolution is illustrated by:

  1. Bacterium and protozoan
  2. Rat and dog
  3. Dogfish and whale
  4. Starfish and cuttle fish
AIPMT 2003
4

Which one of the following sequences was proposed by Darwin and Wallace for organic evolution?

  1. Variations, natural selection, overproduction, constancy of population size
  2. Overproduction, constancy of population size, variations, natural selection
  3. Variations, constancy of population size, overproduction, natural selection
  4. Overproduction, variations, constancy of population size, natural selection
AIPMT 2003
5

Random genetic drift in a population probably results from

  1. Constant low mutation rate
  2. Interbreeding within this population
  3. Large population size
  4. Highly genetically variable individuals
AIPMT 2003
6

Industrial melanism is an example of :-

  1. Darkening of skin due to smoke from industries
  2. Defensive adaptation of skin against ultraviolet radiations
  3. Drug resistance
  4. Protective resemblance with the surroundings
AIPMT 2003
7

In a random mating population in equilibrium, which of the following brings about a change in gene frequency in a non-directional manner :-

  1. Selection
  2. Random drift
  3. Mutations
  4. Migration
AIPMT 2003
8

Darwin in his 'Natural Selection Theory' did not believe in any role of which one of the following in organic evolution ?

  1. Survival of the fittest
  2. Parasites and predators as natural enemies
  3. Discontinuous variations
  4. Struggle for existence
AIPMT 2003
9

Which one of the following describes correctly the homologous structures ?

  1. Organs with anatomical dissimilarities but performing same function
  2. Organs that have no function now, but had an important function in ancestors
  3. Organs with anatomical similarities, but performing different functions
  4. Organs appearing only in embryonic stage and disappearing later in the adult
AIPMT 2003
10

In recent years, DNA sequences (nucleotide sequence) of mt-DNA and Y chromosomes were considered for the study of human evolution, because :-

  1. They are uniparental in origin and do not take part in recombination
  2. They can be studied from the samples of fossil remains
  3. Their structure is known in greater detail
  4. They are small, and therefore, easy to study
AIPMT 2003
11

Some bacteria are able to grow in streptomycin containing medium due to

  1. natural selection
  2. induced mutation
  3. reproductive isolation
  4. genetic drift.
AIPMT 2002

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