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Diversity in Living Organisms Test - 20

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Diversity in Living Organisms Test - 20
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  • Question 1
    1 / -0

    Assertion: Most fish when out of the water, die of suffocation.

    Reason: Atmospheric air contains far less oxygen content than the dissolved
    oxygen in the water.

    Solution
    1. Fish exchange gases by pulling oxygen-rich water through their mouths and pumping it over their gills. When taken out of the water, gills (the respiratory organ) stick together thereby reducing the surface area, leaving the blood vessels no longer exposed to oxygen in the air. So, it is correct that most of the fish do die of suffocation when out of the water and thus, the assertion statement is correct. 
    2. The atmospheric air contains far more oxygen content than water (air contain 21% oxygen and water contains 0.5 - 0.9% of dissolved oxygen by volume depending on the temperature). So, the statement is wrong and not a correct reason for the given assertion. 
    Hence, option C is correct. 
  • Question 2
    1 / -0
    One of the representatives of phylum Arthropoda is : 
    Solution
    The Silverfish is a small insect and all insects belong to phyllum Arthropoda. Pufferfish belongs to phyllum Chordata, cuttlefish belongs to phyllum Mollusca and flyingfish belongs to phyllum Chordata. So the correct option is B.
  • Question 3
    1 / -0
    Which is vivipary ______________.
  • Question 4
    1 / -0
    The venom of cobra affects the 
    Solution
    Cobra belongs to the family Elapidae. All members of Elapidae produce neurotoxic venom.
    This venom causes harm to the nervous system of prey directly. Neurotoxins inhibit neurons to control the ion concentrations across the cell membrane, or communication between neurons across a synapse. Thus the function of the nervous system gets arrested. 
    So the correct option is C.
  • Question 5
    1 / -0
    Which one of the following is a matching pair of a body feature and the animal possessing it:
    Solution

    Solution:

    Correct answer is option B.
    Explanation for correct answer:
    • Leeches are segmented parasitic worms belonging to the subclass Hirudinea within the phylum Annelida. It has a ventral central nervous system.

    Explanation for incorrect options:

    • All chordates have a post-anal tail. A post-anal tail is an extension of the body that runs past the anal opening. The octopus is not a member of the phylum Chordata.
    • Pharyngeal gill slits are characteristic features of chordates. Chameleons are reptiles. So, their embryo has pharyngeal gill slits.
    • Scorpion has a dorsal heart.

  • Question 6
    1 / -0
    The most primitive vertebrates are ______________.
  • Question 7
    1 / -0
    The lower jaw of a mammal is made up
    Solution
    Dentary is a tooth bearing bone. In mammals it is lower jaw bone consisting of single membrane bone on each side and fused together infront.
  • Question 8
    1 / -0
    The groups of animals similar to fish in reproduction are
    Solution
    • A frog is any member of a diverse and largely carnivorous group of short-bodied, tailless amphibians composing the order Anura.
    • Both frogs and fish usually lay eggs in water. Some fish like guppies and certain sharks, give live birth instead of laying eggs.
    • In frogs and fishes, the female releases her eggs and the male releases his sperm at the same time in the water. External fertilization takes place and eggs are released in water.
    • So, the correct answer is 'Frogs'.
  • Question 9
    1 / -0
    Character found only in mammals is 
    Solution
    The diaphragm is the only organ, which only and all mammals have and without which no mammals can live. It is a sheet of internal skeletal muscle that extends across the bottom of the thoracic cavity. The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration. As the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs. Hence, option D is correct.
  • Question 10
    1 / -0
    Which of the following is not a characteristic feature of birds?
    Solution

     

    Birds are vertebrates belonging to class Aves. These are characterised by the presence of feathers, beaks, and wings. Their forelimbs are modified into wings that are covered with feathers. They have toothless beaked jaws. Hence, out of the four characteristics mentioned in the options, birds do not have teeth.

    So, the correct answer is 'Presence of teeth'.


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