GK Quiz 108: Biology Quiz for SSC and other exams

General Awareness Quiz – Biology

General Awareness Quiz Set 108 for SSC CGL, SSC CHSL and Railways exams. Biology Quiz for SSC CGL, SSC CHSL, Railways etc.

Topic: General Science – Biology

  1. The causal organism of polio is:
    A) A Fungi
    B) A Bacteria
    C) A Worm
    D) A Virus
    View answer
      Option D.
    Explanation: Virus.Polio is a highly infectious disease caused by a virus. Its causative agent, poliovirus, was identified in 1908 by Karl Landsteiner. The polio virus invades the nervous system, and can cause total paralysis in a matter of hours.
  2. Wings of birds are:
    A) Modified four limbs
    B) Integumentary outgrown
    C) New Structure
    D) Modified hind limbs
    View answer
      Option A.
    Explanation: The wings are modified forelimbs of birds which are the key to bird flight. Each wing composed of three limb bones, the humerus, ulna and radius
    .
  3. Wilting of plants occurs due to excessive
    A) Transpiration
    B) Respiration
    C) Guttation
    D) Absorption
    View answer
    Option A.
    Explanation: Transpiration. Plant wilting occurs after excessive loss of water by transpiration and lesser absorption. On a hot day plants transpire heavily and cannot absorb water speedily to keep pace with transpiration loss, even when there is enough water
  4. Haptens are
    A) Isoantigens
    B) Antibodies
    C) Pseudoantigens
    D) Incomplete antigens
    View answer
    Option D.
    Explanation: Haptens are small molecules that react with a specific antibody but cannot induce the formation of antibodies unless bound to a carrier protein or other large antigenic molecule. They are incomplete or partial antigens.
  5. Which one of the following statements about PYROLYSIS, which is a process for solid waste treatment is incorrect?
    A) It converts the waste intoSolid, liquid and gas of which the resultant liquid and gas can be used to produce Energy.
    B) The process occurs at a temperature above 430°C at atmospheric pressure.
    C) The process occurs under highpressure at temperature above 430°C .
    D) It is a thermochemical decomposition of organic waste.
    View answer
    Option B.
    Explanation: Pyrolysis is a thermo-chemical decomposition of organic material at elevated temperatures in the absence of oxygen (or any halogen). Pyrolysis generally takes place well above atmospheric pressure at temperatures exceeding above 430 °C.
  6. Thymidinedimer formation in DNA is caused by
    A) UV rays
    B) X rays
    C) B and G rays
    D) IR rays
    View answer
    Option A
    Explanation: UV rays
  7. Which bacterial strain developed from natural isolates by genetic manupilations can be used for treating oil spills?
    A) Nitrosomonas
    B) Clostridium
    C) Agrobacterium
    D) Pseudomonas
    View answer
    Option A.
    Explanation:Nitrosomonas is a genus of Gram-negative rod-shaped chemoautotrophic bacteria. This organism oxidizes ammonia into nitrite as a metabolic process. This rare bacteria oxidizes ammonia into nitrite as a metabolic process. Nitrosomonas are useful in treatment of industrial and sewage waste and in the process of bioremediation.
  8. AIDS virus destroy
    A) Basophils
    B) Neutrophils
    C) Monocytes
    D) Lymphocytes
    View answer
    Option D.
    Explanation:AIDS virus destroys the T-cells inside of theimmune system. Tcells or T lymphocytes belong to agroup of white blood cells known as lymphocytes,and play a central role in cell-mediated immunity
    .
  9. The process through which excess of light energy is dissipated in photosynthesis is known as
    A) Quenching
    B) Photolysis
    C) Scavenging
    D) Photophosphorylation
    View answer
    Option A.
    Explanation:Quenching is a process in which absorbed light energy is dissipated as heat and does not take partin photochemistry. The phenomenon involves quenching of chlorophyll a (Chla) fluorescence, which induced under steady-state illumination.
  10. Which of the following plant pigments absorbs in red and far red region of light:
    A) Carotenoid
    B) Chlorophyll
    C) Cryptochrome
    D) Phytochrome
    View answer
    Option D.
    Explanation: Phytochrome is a photoreceptor, a pigment that plants use to detect light. It is a protein with a bilin chromophore. It detects mainly red and far-red region of visible spectrum and regulates germination of seeds

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