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Evolution · Question 116

AIPMT 2001MCQEasy📈 Topic in 12% papers+4−1
1

First life on earth was : -

  1. Autotrophs
  2. Photoautotrophs
  3. Cyanobacteria
  4. Chemoheterotrophs

Answer

(4) Chemoheterotrophs

Solution

As per NCERT (Oparin–Haldane), the first form of life arose from pre-existing non-living organic molecules (RNA, protein etc.) in the 'hot dilute soup' of the primitive sea.

⇒ The first organisms were anaerobic and could not make their own food; they obtained energy by breaking down the ready-made organic molecules present around them.

⇒ Such organisms are chemoheterotrophs; autotrophs (including photoautotrophs like cyanobacteria) evolved later.

∴ First life on earth was chemoheterotrophic.

Answer: (4)

AIPMT 2001

Keep practising — Evolution

2

Forthcoming generations are less adaptive than their parental generation due to

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

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
4

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
5

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
6

Which is not a vestigial organ in man?

  1. Segmental muscles of abdomen
  2. Third molar
  3. Coccyx
  4. Nails
AIPMT 2000
7

Homo sapiens have evolved in

  1. Pleistocene
  2. Paleocene
  3. Oligocene
  4. Holocene
AIPMT 2000
8

Character which is closely related to human evolution

  1. Reduction in size of jaws
  2. Disappearance of tail
  3. Flat nails
  4. Binocular vision
AIPMT 2000
9

Which evidence of evolution related to Darwin's finches?

  1. Evidences from comparative anatomy
  2. Evidences from embryology
  3. Evidences from biogeographical distribution
  4. Evidences from palaeontological
AIPMT 2000
10

Who is directly related to man?

  1. Gorilla
  2. Orangutan
  3. Gibbon
  4. Rhesus
AIPMT 2000

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