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BIOLOGY M.C.Q (1 Marks)

Evolution · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 282 questions.

Questions · Page 6 of 6

M.C.Q (1 Marks)

MCQ 2511 Mark
Mutations which normally happen randomly are considered one of the raw materials for evolution because they:
  • A
    Are stable
  • ✓
    Contribute to new variation in organism.
  • C
    Cause death of organism.
  • D
    None of the above.
Answer
Correct option: B.
Contribute to new variation in organism.
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MCQ 2521 Mark
Variations during mutations of meiotic recombinations are:
  • ✓
    Random and directionless.
  • B
    Random and directional.
  • C
    Random and small.
  • D
    Random, small and directional.
Answer
Correct option: A.
Random and directionless.
Variations during mutations of meiotic recombinations are random and directionless.
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MCQ 2531 Mark
Stanley $L.$ Miller conducted experiments before $1953$ on prebiotic earth environment using special apparatus. The primary surprising products wereStanley $L.$ Miller conducted experiments before $1953$ on prebiotic earth environment using special apparatus. The primary surprising products were:
  • ✓
    Amino acids.
  • B
    Peptides.
  • C
    Nucleotides.
  • D
    Simple sugars.
Answer
Correct option: A.
Amino acids.
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MCQ 2541 Mark
Animal husbandry and plant breeding programmes are the examples of:
  • ✓
    Artificial selection.
  • B
    Reverse evolution.
  • C
    Mutation.
  • D
    Natural selection.
Answer
Correct option: A.
Artificial selection.
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MCQ 2561 Mark
Which is the latest era of geological time scale?
  • A
    Azoic
  • B
    Proterozoic
  • ✓
    Coenozoic
  • D
    Mesozoic
Answer
Correct option: C.
Coenozoic
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MCQ 2571 Mark
What is ethnobotany?
  • A
    Relationship between primitive plants and people.
  • ✓
    Study of traditional plantlore, plant use, etc.
  • C
    Cultivation of flower yielding plants.
  • D
    Study of soil.
Answer
Correct option: B.
Study of traditional plantlore, plant use, etc.
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MCQ 2581 Mark
Similarities in organisms with different genotype indicates.
  • A
    Micro$-$evolution.
  • B
    Macro$-$evolution.
  • ✓
    Convergent evolution.
  • D
    Divergent evolution.
Answer
Correct option: C.
Convergent evolution.
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MCQ 2591 Mark
Among the human ancestors the brain size was more than $1000 \ cc$ in:
  • ✓
    Homo neanderthalensis.
  • B
    Homo erectus.
  • C
    Ramapithecus.
  • D
    Homo habilis.
Answer
Correct option: A.
Homo neanderthalensis.
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MCQ 2601 Mark
How many living species have been described so far?
  • A
    $12$ million
  • B
    $8$ million
  • C
    $8.7$ million
  • ✓
    $2$ million
Answer
Correct option: D.
$2$ million
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MCQ 2611 Mark
Which one of the following period is largely associated with extinction of dinosaurs and the increase in flowering plants and reptiles?
  • A
    Jurassic
  • B
    Triassic
  • ✓
    Cretaceous
  • D
    Permian
Answer
Correct option: C.
Cretaceous
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MCQ 2621 Mark
In which of the following era man was originated?
  • A
    Paleocene
  • ✓
    Pliocene
  • C
    Miocene
  • D
    Devonian
Answer
Correct option: B.
Pliocene
Pliocene is the epoch of tertiary period of coenozoic era. Man was originated in this era.
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MCQ 2631 Mark
Which of the following is homologous organ?
  • A
    Wings of birds and locust.
  • ✓
    Wings of birds $($sparrow$)$ and pectoral fins of fish.
  • C
    Wings of bat and butterfly.
  • D
    Legs of frog and cockroach.
Answer
Correct option: B.
Wings of birds $($sparrow$)$ and pectoral fins of fish.
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MCQ 2641 Mark
What was the most significant trend in the evolution of modern man $($Homo sapiens$)$ from his ancestors?
  • A
    Upright posture.
  • B
    Shortening of jaws.
  • C
    Binocular vision.
  • ✓
    Increasing brain capacity.
Answer
Correct option: D.
Increasing brain capacity.
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MCQ 2651 Mark
How is extinction represented in a family tree diagram?
  • A
    When a branch splits.
  • ✓
    When a branch ends.
  • C
    When a branch shifts along $x -$ axis.
  • D
    When a branch shifts along $y -$ axis.
Answer
Correct option: B.
When a branch ends.
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MCQ 2661 Mark
The first probable fossil of man was:
  • ✓
    Ramapithecus
  • B
    Zinjanthropus
  • C
    Pithecanthropus
  • D
    Plesianthropus
Answer
Correct option: A.
Ramapithecus
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MCQ 2671 Mark
Most primitive living mammals which provide an evidence of organic evolution from geographical distribution are found in:
  • A
    China
  • B
    India
  • ✓
    Australia
  • D
    Africa
Answer
Correct option: C.
Australia
Prototherians the most primitive mammals which provide an evidence of organic evolution from geographical distribution are found is Australia.
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MCQ 2681 Mark
Which era is dubbed as the age of prokaryotic microbes?
  • A
    Phanerozoic
  • B
    Proterozoic
  • ✓
    Precambrian
  • D
    Archean
Answer
Correct option: C.
Precambrian
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MCQ 2691 Mark
In which period, birds in geological development of earth arose?
  • A
    Permian
  • B
    Carboniferous
  • ✓
    Jurassic
  • D
    Oligocene and eocene
Answer
Correct option: C.
Jurassic
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MCQ 2701 Mark
Which primitive man used stones to produce fire?
  • ✓
    Java man
  • B
    Neanderthal man
  • C
    Cro$-$Magnon man
  • D
    All of the above
Answer
Correct option: A.
Java man
Homo erectus made tools made of stones and bones and made fire using primitive stone tools. Java ape man or Homo erectus erectus lived in caves and knew use of fire for hunting, defence and cooking.
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MCQ 2711 Mark
Equilibrium of gene frequencies is:
  • A
    $p^2 \times 2 p q \times q^2=1$
  • B
    ​​$\sigma=\sqrt{\frac{\text{Pq}}{\text{N}}}$
  • ✓
    Hardy$-$Weinberg law
  • D
    Mutation
Answer
Correct option: C.
Hardy$-$Weinberg law
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MCQ 2721 Mark
The force that initiates evolution is:
  • ✓
    Variation
  • B
    Mutation
  • C
    Extinction
  • D
    Adaptation
Answer
Correct option: A.
Variation
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MCQ 2731 Mark
Which of the following had the smallest brain capacity?
  • A
    Homo sapiens.
  • B
    Homo neanderthalensis.
  • ✓
    Homo habilis.
  • D
    Homo erectus.
Answer
Correct option: C.
Homo habilis.
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MCQ 2741 Mark
Evolutionary convergence is characterized by:
  • A
    Development of characteristics by random mating.
  • B
    Replacement of common characteristics in different group.
  • C
    Development of dissimilar characteristics in closely related groups.
  • ✓
    Development of a common set of characteristics in group of different ancestry.
Answer
Correct option: D.
Development of a common set of characteristics in group of different ancestry.
Convergent evolution describes the independent evolution of similar features in species of different lineages.
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MCQ 2751 Mark
The era called as 'age of prokaryotic microbes' is:
  • A
    Archaeozoic
  • B
    Precambrian
  • C
    Phaenerozoic
  • ✓
    Proterozoic
Answer
Correct option: D.
Proterozoic
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MCQ 2761 Mark
Life originated in:
  • ✓
    Precambrian era
  • B
    Proterozoic era
  • C
    Mesozoic era
  • D
    Cenozoic era
Answer
Correct option: A.
Precambrian era
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MCQ 2771 Mark
Extremities, tail and ear are relatively shorter in animals living in cooler regions as compared to those inhabiting warmer zones. This is:
  • A
    Bergman’s rule.
  • B
    Jordan’s rule.
  • C
    Gloger’s rule.
  • ✓
    Allen’s rule.
Answer
Correct option: D.
Allen’s rule.
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MCQ 2791 Mark
Adaptive radiation refers to:
  • A
    Power of adaptation in an individual to a variety of environments.
  • B
    Adaptations due to Geographical isolation.
  • ✓
    Evolution of different species from a common ancestor.
  • D
    Migration of members of a species to different geographical areas.
Answer
Correct option: C.
Evolution of different species from a common ancestor.
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MCQ 2801 Mark
"Foolish Seedling" disease of rice led to the discovery of:
  • A
    $\text{IAA}$
  • ✓
    $\text{GA}$
  • C
    $\text{ABA}$
  • D
    $2, 4 – \text{D}$
Answer
Correct option: B.
$\text{GA}$
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MCQ 2811 Mark
Which one of the following describes correctly the homologous structures?
  • A
    Organs appearing only in embryonic stage and disappearing later in the adult.
  • ✓
    Organs with anatomical similarities, but performing different functions.
  • C
    Organs with anatomical dissimilarities, but performing same functions.
  • D
    Organs that have no function now, but had an important function in ancestors.
Answer
Correct option: B.
Organs with anatomical similarities, but performing different functions.
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MCQ 2821 Mark
What was the most significant trend in the evolution of modern man $($Homo sapiens$)$ from his ancestors?
  • ✓
    Increasing cranial capacity.
  • B
    Upright posture.
  • C
    Shortening of jaws.
  • D
    Binocular vision.
Answer
Correct option: A.
Increasing cranial capacity.
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