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BIOLOGY M.C.Q (1 Marks)

MODEL PAPER 7 · 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
The most important feature in a plasmid to serve as a vector in gene cloning experiment is:
  • A
    Its size
  • B
    Presence of a selectable marker
  • C
    Origin of replication (ori)
  • D
    Presence of sites for restriction endonuclease
Answer
Origin of replication (ori)
Explanation: Origin of replication (ori) is a sequence from where replication starts and any piece of DNA, when linked to this sequence, can be made to replicate within the host cells. This sequence is also responsible for controlling the copy number of the linked DNA.
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MCQ 21 Mark
Which of the following seeds have remained alive for the longest period?
  • A
    Yucca gigantea
  • B
    Mangifera indica
  • C
    Striga asiatica
  • D
    Phoenix dactylifera
Answer
Phoenix dactylifera
Explanation: Phoenix dactylifera remained alive for longer period
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MCQ 31 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 41 Mark
Among the following, where do you think the process of decomposition would be the fastest?
  • A
    Alpine region
  • B
    Antarctic
  • C
    Dry arid region
  • D
    Tropical rain forest
Answer
Tropical rain forest
Explanation: Dead plant remains such as leaves, bark, flowers, and dead remains of animals, including fecal matter, constitute detritus, which is the raw material for decomposition. The tropical rain forest produces the highest biomass and hence produces the highest detritus. Hence the rate of decomposition is highest in the tropical rain forest.
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MCQ 51 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 61 Mark
Given below is a highly simplified representation of human sex chromosomes from a karyotype. The genes a and b could be of:
Image
  • A
    Colour blindness and body height
  • B
    Attached ear lobe and Rh blood group
  • C
    Phenylketonuria and haemophilia
  • D
    Haemophilia and red green colour blindness
Answer
Haemophilia and red green colour blindness
Explanation: Haemophilia and red-green colour blindness both are a sex-linked recessive gene on X chromosome. Body height is an example of polygenic inheritance. Rhesus blood group is base on the presence or absence of Rh-protein on the surface of RBC, phenylketonuria (PKU) is a recessive autosomal variation.
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MCQ 71 Mark
Which of the following organisms not fix atmospheric nitrogen?
  • A
    Oscillatoria
  • B
    Nostoc
  • C
    Spirogyra
  • D
    Anabaena
Answer
Spirogyra
Explanation: Spirogyra is a filamentous alga. This alga does not fix atmospheric nitrogen. Anabaena, Nostoc, and Oscillatoria can heterocyst that can fix atmospheric nitrogen.
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MCQ 91 Mark
A human male decides to adopt a surgical method for contraception. Identify the point in the diagram where a cut would be made and tied.
Image
  • A
    Point P
  • B
    Point S
  • C
    Point Q
  • D
    Point R
Answer
Point Q
Explanation: Point Q
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MCQ 101 Mark
Which one among the following regions is not a hotspot of biodiversity?
  • A
    The Indo-Burma Region
  • B
    The Western Ghats and Sri Lanka
  • C
    The Himalayas
  • D
    Jaintia Hills in Meghalaya
Answer
Jaintia Hills in Meghalaya
Explanation: The hotspot area includes all the seven districts, i.e. East Garo Hills, West Garo Hills, South Garo Hills, East Khasi Hills, West Khasi Hills, Jaintia Hills and Ri-Bhoi
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MCQ 111 Mark
The specialized procedure to form an embryo in a laboratory in which a sperm is directly injected into the ovum is called:
  • A
    Zygote intra fallopian transfer
  • B
    Intracytoplasmic sperm injection
  • C
    Intra - uterine insemination
  • D
    Gamete intrafallopian transfer
Answer
Intracytoplasmic sperm injection
Explanation: Intracytoplasmic sperm injection is a specialized procedure to form an embryo in a laboratory in which a sperm is directly injected into ovum for fertilization to form a zygote.
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MCQ 121 Mark
Ecosystem creates :
  • A
    Food chains
  • B
    Both of these
  • C
    Food web
  • D
    Ecological pyramid
Answer
Both of these
Explanation: Both of these
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