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Diversity in Living Organisms Test - 31

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Diversity in Living Organisms Test - 31
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  • Question 1
    1 / -0
    The ancestors of modern day frogs and salamanders are ____________.
    Solution
    The answer is option A i.e. "Coelocanth".

    • Coelocanth evolved into the first amphibians that lived on land and water. These were ancestors of modern-day frogs and salamanders.
    • Amphioxus were ancestors of chordates.
    • Jawless fishes were ancestors of cephalochordates.
    • Hemichordates were just a group of marine invertebrate animals. They lack any type of backbone or chord.
  • Question 2
    1 / -0
    In arthropods, segmentation is absent _____________.
    Solution
    Answer is option A i.e. "Externally"
    Segmentation means the division of animal's body into a series of repetitive segments. It is only external in arthropods. In arthropods, internally the segments are not marked by partitions. Therefore thorax, head and abdomen are fused. Also, coelom region does not contain any segment.
  • Question 3
    1 / -0
    Which of the following is not a fresh water fish?
    Solution
    A. Pomfret
    Pomfret is a  bony marine fish belonging to family Barmidae. While, Kalbasu, Rohu and Catla are fresh water carps.
    So, the correct answer is 'Pomfret'
  • Question 4
    1 / -0
    Statement (S). Fishes belonging to Chondrichthyes have heterocercal caudal fin.
    Reason (R).    These fishes have an air bladder that acts as a hydrostatic organ.
    Solution
    Answer is option A i.e. "S is correct but R is wrong"
    Chondrichthyes are the cartilageous fishes. They have skeletons made of cartilage rather than bone. One of the important characteristics present in Chondrichthyes is the heterocercal caudal fin, which helps in locomotion. It is organ called swim bladder, a sac of air that acts as a hydrostatic organ and not heterocercal caudal fin.
  • Question 5
    1 / -0
    Petromyzon is
  • Question 6
    1 / -0
    Most poisonous fish is _____________.
    Solution
    D. Puffer fish
    Reason: Puffer fish is a marine aquatic life form. It is very poisonous. It releases a very potential toxin called Tetrodotoxin, a variety of neurotoxin.  The myth is that one puffer fish can kill 30 human beings at a time.
  • Question 7
    1 / -0
    Find out the wrongly matched pair.
    Solution
    B. Flame cells-Defence
    Reason: A flame cell is a specialized excretory cell found in the simplest freshwater invertebrates, including flatworms, rotifers and nemerteans. These are the simplest animals to have a dedicated excretory system. Functions of flame cells are same as kidney that is removing waste materials. Bundles of flame cells are known as protonephridia. It's not used for any kind of defence mechanism. So the correct option is B.
  • Question 8
    1 / -0
    Which of the following reptiles has four chambered heart?
    Solution
    Generally Reptiles have two artia and one partially divided ventricle i.e three chambered heart. But Crocodiles have four chambered heart among reptiles. 
    So, the correct answer is B.
  • Question 9
    1 / -0
    Large movable spines occur in fish ___________.
  • Question 10
    1 / -0
    Which one of the following is poikilothermal?
    Solution
    Throughout the evolutionary process sea tortoise have retained these features: Like all reptiles, they are poikilothermal which means that they use the heat of the environment as the main source of maintaining body heat.
    So, option C is the correct option.
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