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Evolution · Question 110

AIPMT 2002MCQEasy📈 Topic in 38% papers+4−1
1

In which era reptiles were dominant ?

  1. Archaeozoic era
  2. Mesozoic era
  3. Coenozoic era
  4. Paleozoic era

Answer

(2) Mesozoic era

Solution

The geological time scale: Archaeozoic → Proterozoic → Palaeozoic → Mesozoic → Coenozoic.

As per NCERT, reptiles (dinosaurs, Ichthyosaurs, etc.) dominated the earth about 200 mya; they declined suddenly about 65 mya.

⇒ This span (Triassic, Jurassic and Cretaceous periods) is the Mesozoic era, the 'Age of Reptiles'.

∴ Reptiles were dominant in the Mesozoic era.

Answer: (2)

AIPMT 2002

Keep practising — Evolution

2

Half life period of C14 is : -

  1. 5000 years
  2. 50 years
  3. 500 years
  4. 5 104 years
AIPMT 2001
3

Similarities in organism with different genotype indicates : -

  1. Divergent evolution
  2. Macroevolution
  3. Convergent evolution
  4. Microevolution
AIPMT 2001
4

Reason of diversity in living beings : -

  1. Mutation
  2. Short term evolutionary change
  3. Long term evolutionary change
  4. Gradual change
AIPMT 2001
5

Which of the following is closest relative of man ?

  1. Gorilla
  2. Chimpanzee
  3. Gibbon
  4. Orangutan
AIPMT 2001
6

Which of the following is correct order of the evolutionary history of man ?

  1. Peking man, Heidelberg man, Neanderthal man, Cro-Magnon man
  2. Peking man, Neanderthal man, Homo sapiens, Cro-Magnon man
  3. Peking man, Neanderthal man, Homo sapiens, Heidelberg man
  4. Peking man, Homo sapiens, Neanderthal man, Cro-Magnon man
AIPMT 2001
7

First life on earth was : -

  1. Autotrophs
  2. Photoautotrophs
  3. Cyanobacteria
  4. Chemoheterotrophs
AIPMT 2001
8

Forthcoming generations are less adaptive than their parental generation due to

  1. Genetic drift
  2. Natural selection
  3. Mutation
  4. Adaptation
AIPMT 2001
9

Occurrence of endemic species in South America and Australia is due to

  1. There is no terrestrial route to these places
  2. Retrogressive evolution
  3. These species have become extinct from other regions
  4. Continental separation
AIPMT 2001
10

Darwin's theory of pangenesis shows similarity with theory of inheritance of acquired characters then what shall be correct according to it

  1. There should be some physical basis of inheritance
  2. Size of organs increase with aging
  3. Useful organs become strong and developed while useless organs become extinct. These organs help in struggle for survival
  4. Development of organs is due to will power
AIPMT 2001
11

In Lederberg's replica plating experiment, what shall be used to obtain a streptomycin-resistant strain?

  1. Only minimal medium
  2. Complete medium and streptomycin
  3. Only complete medium
  4. Minimal medium and streptomycin
AIPMT 2001

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