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BIOLOGY M.C.Q [1M]

MODEL PAPER 2 · Bihar Board (BSEB) STD 12 Science (BSEB - English Medium). 12 questions.

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M.C.Q [1M]

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12 questions · timed · auto-graded

MCQ 21 Mark
The diagram represents miller's experiment. Choose the correct combination of labelling.

Image
  • A
    A-electrodes, B-NH3 + H2O, C-hot water, D-tap, E-U trap
  • B
    A-electrodes, B-NH4+ H2 + CO2 +CH3, C- hot water, D-vacuum, E-U trap
  • C
    A-electrodes, B-NH3 + H2 + H2O +CH2, C- cold water, D-vacuum, E-U trap
  • D
    A-electrodes, B-NH3 + H2 + H2O +CH4, C- steam, D-vacuum, E-U trap
Answer
A-electrodes, B-NH3 + H2 + H2O+CH2, C-cold water, D-vacuum, E-U trap
Explanation: A-electrodes, B-NH3 + H2 + H2O +CH2, C-cold water, D-vacuum, E-U trap
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MCQ 31 Mark
Dodo is
  • A
    extinct
  • B
    critically endangered
  • C
    endangered
  • D
    rare
Answer
extinct
Explanation: The dodo is an extinct flightless bird that was endemic to the island of Mauritius, east of Madagascar in the Indian Ocean. The last confirmed sighting of a dodo was in 1681 and by the end of the 17th century, there were no dodos left.
Image

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MCQ 41 Mark
The amount of usable energy which is available for doing work, when the temperature and pressure are uniform throughout the system, is called:
  • A
    Free energy
  • B
    Spontaneous energy
  • C
    Activation energy
  • D
    Enthalphy
Answer
Free energy
Explanation: Free energy
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MCQ 51 Mark
DNA fragments move at different distances in Gel Electrophoresis because:
  • A
    The voltage is too high.
  • B
    Molecular weights of the fragments are different.
  • C
    DNA has a positive charge.
  • D
    DNA gets denatured.
Answer
Molecular weights of the fragments are different.
Explanation: Gel electrophoresis is a technique used to separate DNA fragments (or other macromolecules, such as RNA and proteins) based on their size and charge. Electrophoresis involves running a current through a gel containing the molecules of interest. Based on their size and charge, the molecules will travel through the gel in different directions or at different speeds, allowing them to be separated from one another.
During gel electrophoresis, different fragments move at different distances due to differences in their molecular weight of the fragments. Smaller fragments move more towards the anode.
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MCQ 61 Mark
Study the pedigree chart given below:
Image
What does it show?
  • A
    The pedigree chart is wrong as this is not possible
  • B
    Inheritance of a recessive sex-linked disease like haemophilia
  • C
    Inheritance of a condition like phenylketonuria as an autosomal recessive trait
  • D
    Inheritance of a sex-linked inborn error of metabolism like phenylketonuria
Answer
Inheritance of a condition like phenylketonuria as an autosomal recessive trait
Explanation: Inheritance of a condition like phenylketonuria as an autosomal recessive trait
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MCQ 71 Mark
A vasectomy:
  • A
    Prevents the production of sperms in the testes.
  • B
    Prevents the movement of sperms into the urethra.
  • C
    Prevents the production of semen.
  • D
    Prevents from having erection.
Answer
Prevents the movement of sperms into the urethra.
Explanation: Prevents the movement of sperms into the urethra.
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MCQ 81 Mark
The excreta of cattle, commonly called gobar is rich in _____________ .
  • A
    Bacillus species
  • B
    Rhizobium
  • C
    Pseudomonas putida
  • D
    Methanobacterium
Answer
Methanobacterium
Explanation: Excretory wastes of animals (gobar) is used to get manure and gobar gas. Gobar gas is a methane rich fuel gas produced by the anaerobic breakdown of gobar with the help of methanogenic bacteria present in the gobar in very large numbers.
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MCQ 91 Mark
Represented below is the inheritance pattern of a certain type of trait in humans. Which one of the following conditions could be an example of this pattern?
Image
  • A
    Thalassemia
  • B
    Haemophilia
  • C
    Sickle Cell anemia
  • D
    Phenyl ketonuria
Answer
Haemophilia
Explanation: The inheritance pattern of a certain type of trait in humans shown above is haemophilia. A son cannot inherit the defective gene from his father. This is a recessive trait and can be passed on if cases are more severe with the carrier. Genetic testing and genetic counselling are recommended for families with haemophilia. The disease is X- linked and the father cannot pass haemophilia through the Y-chromosome.
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MCQ 101 Mark
A prokaryotic autotrophic nitrogen-fixing symbiont is found in:
  • A
    Cycas
  • B
    Pisum
  • C
    Alnus
  • D
    Cicer
Answer
Cycas
Explanation: Cycas
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MCQ 111 Mark
The extraction of DNA from the agarose gel is called as:
  • A
    Isolation
  • B
    Elution
  • C
    Transformation
  • D
    Ligation
Answer
Elution
Explanation: The extraction of specific bands of DNA from agarose gels in which they are separated through electrophoresis is known as elution. There are many methods for eluting DNA from a piece of agrose.
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MCQ 121 Mark
Biological equilibrium is an equilibrium among the:
  • A
    Producers and consumers
  • B
    Producers and decomposers
  • C
    Producers
  • D
    Producers, consumers and decomposers
Answer
Producers, consumers and decomposers
Explanation: Producers, consumers and decomposers
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M.C.Q [1M] - BIOLOGY STD 12 Science Questions - Vidyadip