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Biology M.C.Q (1 Marks)

MODEL PAPER 10 · CBSE STD 12 Science (CBSE - 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
An interesting property of restriction enzymes is molecular cutting and pasting. Restriction enzymes typically recognize a symmetrical sequence of DNA.
Image
Notice that the top strand is same as the bottom strand, but reads backward. When the enzyme cuts the strand between G and A, it leaves overhanging chains:
  • A
    Jointed end
  • B
    Both sticky & blunt ends
  • C
    Sticky ends
  • D
    Blunt ends
Answer
Blunt ends
Explanation : Blunt ends
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MCQ 21 Mark
$\alpha$ - interferon acts as
  • A
    Allergen
  • B
    Carcinogen
  • C
    Sedative
  • D
    Biological response modifier
Answer
Biological response modifier
Explanation : There are currently three major types of IFNs: alpha, beta, and gamma. Each type has similar but distinctive capabilities for altering biological responses.
Alpha-IFN was the first Biological response modifier(BRM) approved by the Food and Drug Administration (FDA) in 1986. Two different manufacturers have brands of this product available. 12.
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MCQ 31 Mark
Given below is a pedigree chart of a family with five children. It shows the inheritance of attached ear lobes as opposed to the free ones. The squares represent the male individuals and circles the female individuals. Which one of the following conclusions drawn is correct?
Image
  • A
    The parents are homozygous recessive
  • B
    The parents are heterozygous
  • C
    The trait is Y-linked
  • D
    The parents are homozygous dominant
Answer
The parents are heterozygous
Explanation : A diploid organism is heterozygous at a gene locus when its cells contain two different alleles of a gene. Pedigree chart of a family shows that both male and female children carry the traits for free and attached ear lobes. Hence, the parents are heterozygous for the above-given trait.
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MCQ 41 Mark
In a particular climatic condition, decomposition rate is slower if:
  • A
    Detritus is rich in sugars.
  • B
    Detritus is rich in lignin and chitin.
  • C
    Detritus is rich in humus
  • D
    Detritus is rich in nitrogen.
Answer
Detritus is rich in lignin and chitin.
Explanation : Detritus is rich in lignin and chitin.
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MCQ 51 Mark
The diagram represents miller's 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, $B-NH_4 + H_2 + CO_2 +CH_3, C -$hot water, $D-$vacuum, $E-U$ trap
  • ✓
    $A-$electrodes, $B-NH_3 + H_2 + H_2O+CH_2, C- $cold water, $D-$vacuum, $E-U$ trap
  • D
    $A-$electrodes, $B-NH_3 + H_2 + H_2O+CH_4, C-$ steam, $D-$vacuum, $E-U$ trap
Answer
Correct option: C.
$A-$electrodes, $B-NH_3 + H_2 + H_2O+CH_2, C- $cold water, $D-$vacuum, $E-U$ trap
$ A-$electrodes, $B-NH_3 + H_2 + H_2O+CH_2, C-$ cold water, $D-$vacuum, $E-U$ trap
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MCQ 61 Mark
In a test$-$cross involving $F_1$ dihybrid flies, more parental-type offspring were produced than the recombinant$-$ type offspring. This indicates:
  • A
    Chromosomes failed to separate during meiosis
  • ✓
    The two genes are located on two different chromosomes
  • C
    Both of the characters are controlled by more than one gene.
  • D
    The two genes are linked and present on the same chromosome
Answer
Correct option: B.
The two genes are located on two different chromosomes
 The two genes are linked and present on the same chromosome
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MCQ 71 Mark
Mycorrhiza is an example of:
  • A
    Parasitism
  • B
    Saprophytism
  • C
    Thyroxine
  • D
    Symbiosis
Answer
Symbiosis
Explanation : Symbiosis
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MCQ 81 Mark
Among the following stem cells, which are found in umbilical cord:
  • A
    Adult stem cells
  • B
    Cord blood stem cells
  • C
    Embryonic stem cells
  • D
    All of these
Answer
Embryonic stem cells
Explanation : Embryonic stem cells
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MCQ 91 Mark
Which of the following is a hormone releasing Intra-Uterine Device (IUD)?
  • A
    Multiload-375
  • B
    Vault
  • C
    LNG-20
  • D
    Cervical cap
Answer
LNG-20
Explanation : LNG-20
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MCQ 101 Mark
Hot spots are places where:
  • A
    High degree of habital loss
  • B
    All of these
  • C
    High degree of endemism
  • D
    High degree of species richness
Answer
All of these
Explanation : Hot-spot is areas with a high density of biodiversity or megadiversity which are also the most threatened ones. Hot spots are determined by four factors,
i. Number of species/species diversity.
ii. Degree of endemism.
iii. Degree of a threat to habitat due to its degradation and fragmentation.
iv. Degree of exploitation.
India has two hotspots-North-East Himalayas and the Western Ghats.
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MCQ 111 Mark
In a population, the condition at which the rate of addition of new members is more than the rate of individuals lost indicates:
  • A
    Zero population growth
  • B
    Fluctuating growth
  • C
    Exponential growth
  • D
    Exponential growth
Answer
Exponential growth
Explanation : Exponential growth
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M.C.Q (1 Marks) - Biology STD 12 Science Questions - Vidyadip