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Evolution · Question 68

AIPMT 2008MCQMedium📈 Topic in 12% papers+4−1
1

Which one of the following is incorrect about the characteristics of protobionts (coacervates and microspheres) as envisaged in the abiogenic origin of life?

  1. They could separate combinations of molecules from the surroundings
  2. They were able to reproduce
  3. They were partially isolated from the surroundings
  4. They could maintain an internal environment

Answer

(2) They were able to reproduce

Solution

Protobionts (coacervates of Oparin and microspheres of Fox) were aggregates of abiotically formed organic molecules surrounded by a membrane-like boundary.

⇒ They were partially isolated from the surroundings, could separate combinations of molecules from the surroundings and could maintain an internal environment.

∵ They lacked genetic material, they could not reproduce true copies of themselves.

∴ "They were able to reproduce" is incorrect.

Answer: (2)

AIPMT 2008

Keep practising — Evolution

2

Thorn of Bougainvillea and tendril of Cucurbita are examples of:

  1. analogous organs
  2. homologous organs
  3. vestigial organs
  4. retrogressive evolution
AIPMT 2008
3

The concept of chemical evolution is based on-

  1. Crystallization of chemicals
  2. Effect of solar radiation on chemicals
  3. Possible origin of life by combination of chemicals under suitable environmental conditions
  4. Interaction of water, air and clay under intense heat
AIPMT 2007
4

The finches of Galapagos islands provide an evidence in favour of-

  1. Special Creation
  2. Biogeographical Evolution
  3. Evolution due to Mutation
  4. Retrogressive Evolution
AIPMT 2007
5

When two species of different genealogy come to resemble each other as a result of adaptation, the phenomenon is termed:-

  1. Microevolution
  2. Convergent evolution
  3. Co-evolution
  4. Divergent evolution
AIPMT 2007
6

Adaptive radiation refers to:-

  1. Adaptations due to Geographical isolation
  2. Migration of members of a species to different geographical areas
  3. Evolution of different species from a common ancestor
  4. Power of adaptation in an individual to a variety of environments
AIPMT 2007
7

If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur:-

  1. A normal distribution
  2. A T-shaped curve
  3. A skewed curve
  4. A bi-modal distribution
AIPMT 2007
8

Which one of the following statements is correct?

  1. Ontogeny repeats phylogeny.
  2. There is no evidence of the existence of gills during embryogenesis of mammals.
  3. Stem cells are specialized cells.
  4. All plant and animal cells are totipotent.
AIPMT 2007
9

Which one of the following is not a living fossil?

  1. Peripatus
  2. King crab
  3. Sphenodon
  4. Archaeopteryx
AIPMT 2006
10

An important evidence in favour of organic evolution is the occurrence of-

  1. Homologous organs only
  2. Homologous and vestigial organs
  3. Homologous and analogous organs
  4. Analogous and vestigial organs
AIPMT 2006
11

Which one of the following amino-acids was not found to be synthesized in Miller's experiment?

  1. Aspartic acid
  2. Alanine
  3. Glycine
  4. Glutamic acid
AIPMT 2006

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