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Diversity in Living Organisms Test - 29

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Diversity in Living Organisms Test - 29
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  • Question 1
    1 / -0
    Given below are assertion and reason. Point out if both are true with reason being correct explanation (A), both true but reason not correct explanation (B), assertion true but reason wrong (C), both wrong (D).
    Assertion. Lateral line system is found in fishes and aquatic larval amphibians.
    Reason. Lateral line system has receptors which are the clusters of sensory cells derived from ectoderm.
    Solution
    Lateral line is a group of sense organs found in fishes and amphibian larvae. Hence, assertion is correct.
    The sense organs are made from epidermal cells and contain receptors which respond to displacement caused by electric impulse, motion etc. Hence, reason is also correct but it is not the correct explanation for assertion.
    So, the correct answer is 'B'.
  • Question 2
    1 / -0
    Aquatic animal with prehensile tail is
    Solution
    A. Chamaeleon is a tree dwelling lizard which has the capability to change colour matching its surrondings.
    B. Macaca, commonly known as macaque, is a rhesus monkey.
    C. Exocoetus is a two winged flying fish.
    D. Hippocampus, commonly known as sea horse is a marine fish.
    Prehensile tail is a tail which has the ability to hold or grasp the objects. Such a tail is found in sea horse i.e. Hippocampus.
    So, the correct answer is 'Hippocampus'. 
  • Question 3
    1 / -0
    Fishes with swim bladder without direct communication with exterior and where there is little separation of secretory and absorbent parts are
    Solution
    A. Physostomes are the fishes which contain a pneumatic duct that connects the gas bladder to alimentary canal.
    B. Physoclists are the fishes that lacks the duct connecting air bladder and alimentary canal.
    C. Euphysoclists are the fishes in which a posterior chamber is formed in the absorbent part which separates it from the secretory path.
    D.  Paraphysiclists are the fishes in which the absorbent path is bent and hence, there is little separation between the secretory and absorbent parts. The swim bladder has no direct communication with the exterior.
    So, the correct answer is 'Paraphysoclists'.
  • Question 4
    1 / -0
    Shagreen is skin of:
    Solution
    A. Codfish (Gadus) is a benthopelagic fish that is widely consumed by humans.
    B. Sole fish (Solea) is a flatfish.
    C. Shark belongs to the group of Elasmobranchii fishes which are characterized by a cartilaginous skeleton.
    D. The whale is an aquatic marine mammal.
    Shagreen is an animal hide that consists of the rough and untanned skin of sharks. So, the correct answer is 'Sharks.'
  • Question 5
    1 / -0
    Scoliodon is called dog fish because of its:
    Solution
    Scoliodon is seen in the Bay of Bengal. It is also known as dogfish due to its great sense of smell. Also, its protruded snout-like mouth resembles the mouth of a dog.
    So, the correct answer is option C.
  • Question 6
    1 / -0
    Identify the most appropriate option.

    Fishes have poor sense organs for:
    Solution
    Vision, touch, odor, hearing are generally considered as senses. There are a variety of species in fishes having different kinds of senses. For example, sharks have a strong sense of smell, dolphins have a strong sense of light perception, etc. They generally have a strong sense of detecting vibration too. But they don't develop any specialized system for sound perception.
    So, the correct option is A.
  • Question 7
    1 / -0
    In fast swimming fishes, propulsion is mainly due to
    Solution
    A. Pelvic fins: These fins are also called ventral fins and are paired. These are generally located behind the pectoral fins.
    B. Caudal fins: These fins are the tail fins and maybe homocercal or heterocercal.
    C. Dorsal fins: These are single and located at the back of the body of fish.
    D. Pectoral fins: These are two in number and hence, are paired. These fins are called fish's arm and are located on each side of the body of fish.
    In fast swimming fishes, propulsion i.e. the action of pushing forward, is due to the caudal fin. So, the correct answer is 'Caudal fin'.
  • Question 8
    1 / -0
    Vertebrates do not possess
    Solution
    • The heart of vertebrates is ventrally placed.
    • The body of vertebrates consists of serially arranged vertebrae which comprises of a major part of their axial exoskeleton, the vertebral column or the backbone.
    • The coelom of vertebrates is large and well developed and it is of enterocoelous type.
    Hence, vertebrates do not possess dorsal heart. So, the correct answer is 'Dorsal heart'.
  • Question 9
    1 / -0
    Veliger larva occurs in ____________.
  • Question 10
    1 / -0
    Which of these is an ectoparasite?
    Solution
    Both Myxine and Petromyzon are ectoparasites. They are cyclostomes as they have a circular suctorial mouth, that helps them to attach to the body of other vertebrates. 
    Hippocampus is a true fish. 
    So, the correct answer is option D.
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