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BIOLOGY M.C.Q (0.5 Marks)

MODEL PAPER 9 · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 12 questions.

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M.C.Q (0.5 Marks)

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12 questions · self-marked practice — reveal the answer and mark yourself.

MCQ 11 Mark
Which of the following is included in bioinsecticide?
  • A
    Viruses and bacteria
  • B
    Viruses, bacteria, fungi, protozoans and mites
  • C
    Viruses, bacteria, fungi and protozoa
  • D
    Viruses, bacteria and fungi
Answer
Viruses, bacteria and fungi
Explanation : Viruses, bacteria and fungi
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MCQ 21 Mark
Source of energy in an ecosystem is:
  • A
    Decomposition of plants and animals by bacteria
  • B
    Fermentation of sugars
  • C
    Sunlight
  • D
    Photosynthesis by plants
Answer
Sunlight
Explanation : Sunlight
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MCQ 31 Mark
XO type of sex determination is found in:
  • A
    Elephant
  • B
    Human beings
  • C
    Dog
  • D
    Grasshopper
Answer
Grasshopper
Explanation : In grasshopper, sex determination is of XO type, in which the males have only one X-chromosome besides the autosomes whereas females have a pair of X-chromosome.
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MCQ 51 Mark
Name the spermicidal cream developed by Central Drug Research Institute (Lucknow), India.
  • A
    Corovira
  • B
    Sapindus
  • C
    Spermacid
  • D
    Consap
Answer
Consap
Explanation : Central drug research institute, Lucknow, India has developed a spermicidal cream called Consap. It has the capability of killing the sperm released during insemination.
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MCQ 61 Mark
In transgenics, expression of transgene in target tissue is determined by:
  • A
    Enhances
  • B
    Reporter
  • C
    Transgene
  • D
    Promoter
Answer
Reporter
Explanation : Reporter
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MCQ 81 Mark
Crop rotation is used by farmers to increase:
  • A
    Soil fertility
  • B
    Nitrogenous content of soil
  • C
    Breeding
  • D
    Organic content of soil
Answer
Soil fertility
Explanation : Crop rotation is the method of agriculture in which leguminous plants are grown between two cereal crops. The root nodule of this bacterium fix the atmospheric nitrogen and increase the fertility of the soil.
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MCQ 91 Mark
Study the pedigree chart of a certain family given below and select the correct conclusion which can be drawn for the character
Image
  • A
    The trait under study could not be colour blindness
  • B
    The female parent is heterozygous
  • C
    The male parent is homozygous dominant
  • D
    The parent could not have had a normal daughter for this character
Answer
The female parent is heterozygous
Explanation : Pedigree chart is used to detect the flow of particular trait in the family over several generations. The given charts indicate that the female parent is heterozygous in nature.
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MCQ 101 Mark
Flow of energy in our ecosystem takes place
  • A
    only in one direction
  • B
    possible in two directions
  • C
    in three dimensions
  • D
    may occur in multiple directions
Answer
only in one direction
Explanation : In the ecosystem, the flow of energy takes place in only one direction. The flow of energy takes place from producers to final consumers. The energy present in one trophic level never returns back to the producer.
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MCQ 111 Mark
What was the resultant found in the place marked E?
Image
  • A
    Glucose, fatty acids and lipids
  • B
    Some fatty acids and organic acids
  • C
    Some amino acids as glycine and alanine
  • D
    Organic esters only
Answer
Some amino acids as glycine and alanine
Explanation : In Urey and Miller's experiment, the product formed after the continuous sparking in the mixture of gases at high temperature were some amino acids like glycine and alanine. Sugar and nitrogenous base were also obtained from the same set up by some other scientist.
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MCQ 121 Mark
A river with an inflow of domestic sewage rich in organic waste may result in:
  • A
    An increased production of fish due to biodegradable nutrients.
  • B
    Death of fish due to lack of oxygen.
  • C
    Increased population of aquatic food web organisms.
  • D
    Drying of the river very soon due to algal bloom.
Answer
Death of fish due to lack of oxygen.
Explanation :Death of fish due to lack of oxygen.
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