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BIOLOGY M.C.Q (1 Marks)

MODEL PAPER 5 · Gujarat Board (GSEB) STD 12 Science (GSEB - English Medium). 12 questions.

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M.C.Q (1 Marks)

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12 questions · timed · auto-graded

MCQ 11 Mark
In hybridoma technology:
  • A
    T-cells are fused with myeloma cells.
  • B
    B-cells are fused with T-cells.
  • C
    C-cells are fused with T-cells.
  • D
    B-cells are fused with myeloma cells.
Answer
(d) : B-cells are fused with myeloma cells.
Explanation: B-cells are fused with myeloma cells.
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MCQ 21 Mark
Use of biocontrol measures will greatly reduce our dependence on:
  • A
    Plants and insects
  • B
    Fertilizers and manure
  • C
    Useful chemicals and pesticides
  • D
    Toxic chemicals and pesticides
Answer
(d) : Toxic chemicals and pesticides
Explanation: The use of biocontrol measures will greatly reduce our dependence on toxic chemicals and pesticides. Insects and pests are not killed in this method but kept under control.
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MCQ 31 Mark
On the basis of the sex chromosome shown below, the bird shown is
Image
  • A
    Female
  • B
    Cannot be decided
  • C
    Transgender
  • D
    Male
Answer
(d) : Male
Explanation: Male birds bear ZZ sex chromosome as sex determination is ZO type, in which ZZ is male and ZO is female.
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MCQ 41 Mark
Which of the following supports a dense population of planktons and littoral vegetation ?
  • A
    Eutrophic
  • B
    Oligotrophic
  • C
    Agroecotrophic
  • D
    Lithotrophic
Answer
(a) : Eutrophic
Explanation: Eutrophic
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MCQ 51 Mark
The diagram represents the Miller experiment. Choose the correct combination of labelling.
Image
  • A
    $A -$ electrodes, $B - NH_3+ H_2O,C -$ hot water, $D-$tap, $E - U$ trap
  • B
    $A -$ electrodes, $B - NH_3+ H_2 + H_2O + CH_{4,}C-$steam, $D-$ Vacuum, $E - U$ trap
  • C
    $A-$ electrodes,$B-(NH_3 + H_2+ H_2O + CH_4), C-$cold water, $D -$ Vacuum, $E - U$ Trap.
  • D
    $A -$ electrodes$,B - NH_4 + H_2 + CO_2 + CH_3, C-$hot water$, D -$ Vacuum$, E - U$ Trap.
Answer
 In Urey and Miller experiment the set up labelled as $A -$ electrodes, $B-(NH_3 H_2+H_2O+CH_4), C-$cold water, $D -$ Vacuum, $E - U$ Trap.
Image
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MCQ 61 Mark
Select the option that gives the correct description of the process of Natural Selection with respect to the length of the neck of giraffe.
Image
  • A
    Stabilising selection as giraffes with medium neck lengths are selected.
  • B
    Directional selection as giraffes with longer neck lengths are selected.
  • C
    Stabilising selection as giraffes with longer neck lengths are selected further.
  • D
    Disruptive selection as giraffes with smaller and longer neck lengths are selected.
Answer
(b) : Directional selection as giraffes with longer neck lengths are selected.
Explanation: Directional selection as giraffes with longer neck lengths are selected.
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MCQ 71 Mark
Which one of the following can fix nitrogen?
  • A
    Nostoc
  • B
    Streptococcus
  • C
    Oscillatoria
  • D
    Spirogyra
Answer
(a) : Nostoc
Explanation: Nostoc
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MCQ 81 Mark
Which of the following is not required in the preparation of a recombinant DNA molecule?
  • A
    DNA ligase
  • B
    E.coli
  • C
    Restriction endonuclease
  • D
    DNA fragments
Answer
(b) : E.coli
Explanation: E.coli acts as a host to multiply the recombinant DNA. While forming a recombinant DNA we need a restriction enzyme that will cut out the required DNA fragments which are later joined with the help of DNA ligase.
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MCQ 91 Mark
Which of the following is not a category of contraceptive method?
  • A
    Surgical method
  • B
    Artificial insemination
  • C
    Barrier method
  • D
    Natural method
Answer
(b) : Artificial insemination
Explanation: Artificial insemination is not a contraceptive device. It is an assisted reproductive technology for infertile people. The natural method, barrier method, and surgical methods are categories of contraceptive methods.
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MCQ 101 Mark
The sixth extinction in progress currently is different from all previous extinctions on earth as it is:
  • A
    10-100 times faster
  • B
    100-10000 times faster
  • C
    100-1000 times faster
  • D
    1000-10000 times faster
Answer
(c) : 100-1000 times faster
Explanation: 100-1000 times faster`
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MCQ 111 Mark
The natural method of birth control in which the couples avoid coitus from day 10 to 17 of the menstrual cycle is called:
  • A
    Periodic abstinence
  • B
    Lactational amenorrhea
  • C
    Copulation abstinence
  • D
    Withdrawal
Answer
(a) : Periodic abstinence
Explanation: Periodic abstinence is a natural method of birth control in which the couples avoid sexual intercourse from day 10 to 17 of the menstrual cycle during which ovulation takes place in females.
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MCQ 121 Mark
How much solar energy falling on the leaf of plant is converted into chemical energy?
  • A
    60%
  • B
    10%
  • C
    100%
  • D
    1%
Answer
(d) : 1%
Explanation: 1%
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