PYQSide ExamsMy practice

Evolution · Question 90

AIPMT 2004MCQMedium📈 Topic in 75% papers+4−1
1

Age of fossils in the past was generally determined by radio-carbon method and other methods involving radioactive elements found in the rocks. More precise methods, which were used recently and led to the revision of the evolutionary periods for different groups of organisms include -

  1. Electron spin resonance (ESR) & fossil DNA
  2. Study of carbohydrates/proteins in fossils
  3. Study of the conditions of fossilization
  4. Study of carbohydrates/proteins in rocks

Answer

(1) Electron spin resonance (ESR) & fossil DNA

Solution

Radioactive (radio-carbon) dating gives the age of the rock or fossil only approximately.

⇒ Electron spin resonance (ESR) dating measures the trapped electrons accumulated in fossil teeth, bones and shells with time, giving more precise ages.

⇒ Analysis of fossil (ancient) DNA compares sequences directly with living forms, fixing the times of divergence of groups.

∴ ESR and fossil DNA led to the revision of the evolutionary periods.

Answer: (1)

AIPMT 2004

Keep practising — Evolution

2

What kind of evidence suggested that man is more closely related with chimpanzee than with other hominoid apes ?

  1. Evidence from fossil remains and the fossil mitochondrial DNA alone
  2. Evidence from DNA extracted from sex chromosomes, autosomes
  3. Comparison of chromosome morphology only
  4. Evidence from DNA from sex chromosomes only
AIPMT 2004
3

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
AIPMT 2004
4

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
5

Convergent evolution is illustrated by:

  1. Bacterium and protozoan
  2. Rat and dog
  3. Dogfish and whale
  4. Starfish and cuttle fish
AIPMT 2003
6

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
7

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
8

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
9

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
10

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
11

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

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