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Evolution · Question 102

AIPMT 2002MCQMedium📈 Topic in 12% papers+4−1
1

Some bacteria are able to grow in streptomycin containing medium due to

  1. natural selection
  2. induced mutation
  3. reproductive isolation
  4. genetic drift.

Answer

(1) natural selection

Solution

Resistance to streptomycin arises by a chance (spontaneous) mutation in a few bacterial cells, before any contact with the antibiotic.

⇒ When streptomycin is added to the medium, the sensitive bacteria are killed while the resistant ones survive and multiply.

As per NCERT, the appearance of antibiotic- or drug-resistant microbes within a short time is an example of evolution by natural selection (anthropogenic action).

∴ These bacteria grow in a streptomycin containing medium due to natural selection.

Answer: (1)

AIPMT 2002

Keep practising — Evolution

2

Which of the following is important for speciation ?

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

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
4

Genetic drift operates in : -

  1. Slow reproductive population
  2. Small isolated population
  3. Large isolated population
  4. Fast reproductive population
AIPMT 2002
5

There is no life on moon due to the absence of -

  1. O2
  2. Light
  3. Water
  4. Temperature
AIPMT 2002
6

According to fossils which discovered up to present time, origin and evolution of man was started from

  1. Java
  2. Africa
  3. China
  4. France
AIPMT 2002
7

In which condition, the gene ratio remains constant for any species population ?

  1. Gene flow
  2. Mutation
  3. Sexual selection
  4. Random mating
AIPMT 2002
8

Sequence of which of the following is used to know the phylogeny ?

  1. DNA
  2. r-RNA
  3. m-RNA
  4. t-RNA
AIPMT 2002
9

In which era reptiles were dominant ?

  1. Archaeozoic era
  2. Mesozoic era
  3. Coenozoic era
  4. Paleozoic era
AIPMT 2002
10

Half life period of C14 is : -

  1. 5000 years
  2. 50 years
  3. 500 years
  4. 5 104 years
AIPMT 2001
11

Similarities in organism with different genotype indicates : -

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

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