PYQSide ExamsMy practice

Evolution · Question 95

AIPMT 2003MCQMedium📈 Topic in 12% papers+4−1
1

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

Answer

(2) Overproduction, constancy of population size, variations, natural selection

Solution

Logic of Darwin–Wallace theory of natural selection:

(i) Organisms produce far more offspring than can survive (overproduction).

(ii) Yet, population size remains fairly constant because resources are limited ⇒ struggle for existence.

(iii) Individuals of a population show variations.

(iv) Those with favourable variations survive and reproduce more (natural selection / survival of the fittest).

∴ Sequence: overproduction → constancy of population size → variations → natural selection.

Answer: (2)

AIPMT 2003

Keep practising — Evolution

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

Which of the following is important for speciation ?

  1. Behavioural isolation
  2. Seasonal isolation
  3. Tropical isolation
  4. Reproductive isolation
AIPMT 2002
10

Which of the following are homologous organs ?

  1. Wings of birds & Pectoral fins of fish
  2. Wings of bat & Butterfly
  3. Legs of frog & Cockroach
  4. Wings of birds & Locust
AIPMT 2002
11

Genetic drift operates in : -

  1. Slow reproductive population
  2. Small isolated population
  3. Large isolated population
  4. Fast reproductive population
AIPMT 2002

All Evolution PYQs →

PDFDownload Evolution PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Zoology chapters
Class 11Animal KingdomStructural Organisation in AnimalsBiomolecules (Biology)Digestion and AbsorptionBreathing and Exchange of GasesBody Fluids and CirculationExcretory Products and their EliminationLocomotion and MovementNeural Control and CoordinationChemical Coordination and Integration
Class 12Human ReproductionReproductive HealthEvolutionHuman Health and DiseaseBiotechnology: Principles and ProcessesBiotechnology and its ApplicationsBiology Experimental Skills