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Structural Organisation in Animals Test - 62

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Structural Organisation in Animals Test - 62
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  • Question 1
    1 / -0
    Which of the following cells of cockroach secrete saliva?
    Solution
    Acinar cells of salivary gland of cockroach produce and secrete saliva. It contains water, electrolytes, mucus and enzymes like amylase. The saliva flows out of the acinus into collecting ducts.
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    Consider the following four statements (A-D) related to the common frog Rana tigrina and select the correct option stating which ones are true (T) and which ones are false (F)
    Statements
    (A) On dry land it would die due to lack of $${O}_{2}$$ if its mouth is focibly kept closed for a few days
    (B) It has four-chambered heart
    (C) On dry land it turns uricotelic from urcotelic
    (D) Its life-history is carried out in pond water
    Solution
    A. A-T; B-F; C-F; D-T
    Explanation : In lungs, frog take in air through nostrils and mouth. Through pores they take up additional oxygen their skin directly into the bloodstream. This process called as cutaneous gas exchange. So, on the dry land it would die due to lack of oxygen. Frog have three chambered heart - the left atrium , right atrium and the ventricle. On dry land frogs are ureotelic in nature. The main nitrogenous waste is urea. The frog habitat is in pond water for successful breeding.
    So, the correct option is A.
  • Question 3
    1 / -0
    In insects, muscle contraction, oviposition defecation and heartbeats are regulated by 
    Solution
    Corpora cardiaca are found behind the brain in insects. These are neuroglandular bodies. A prothoracicotropic hormone is produced and stored in it. It is a neurohormone. which activates the prothoracic glands. It also helps in molting. These are considered as endocrine gland which regulates muscle contraction, oviposition defecation, and heartbeats.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    Which of the following are true regarding the common bull frog?
    a) Poisonous
    b) Croaking during peak winters
    c) Mimicry
    d) Hibernation
    e) Carnivorous
    f) Internal fertilization
  • Question 5
    1 / -0
    Frog is _____________.
    Solution
    B. Poikilothermic
    EXPLANATION: A poikilothermic animal is that type of animal, whose internal temperature varies considerably. Poikilotherm is totally opposite to homeotherm. Homeotherm is that type of animal, which can maintain thermal homeostatis. Many terrestrial animals are poikilothermic. These type of animals are able to function over a wider range of temperature. Poikilotherms have large and more complex genomes than homeotherms. Frogs are an important example of this effect. Some other examples of poikilotherm are reptiles, invertebrates, most of the fishes, etc.  
  • Question 6
    1 / -0
    In earthworm skeleton like function is performed by _______________.
    Solution

    The earthworm is invertebrates and as we know invertebrates lacks skeleton. So, the coelomic fluid present in coelomic chambers acts as a hydrostatic skeleton so that the structure is maintained. It is helpful in the contraction and relaxation of the muscles in the earthworm's body. 

    So, the correct answer is option  is (A)

  • Question 7
    1 / -0
    Which of the two parts in cockroach are fundamentally similar in structure?
    Solution
    C.  Maxillae and legs.
    Explanation : Maxillae and legs are fundamentally similar structure in cockroach. Maxillae consists of 3 parts  like protopodite, endopodite and  expedite. Legs are 3 pairs and each consists of five parts.
    So, the correct option is C.
  • Question 8
    1 / -0
    Human heart contains $$4$$ chambers, whereas cockroach has a heart with.
    Solution
    Human heart contains 4 chambers. Whereas cockroach's heart contains 13 chambers. Due to so many chambers, failure of any one chamber is not life-threatening for it. These chambers are funnel-shaped with tiny holes called ostia. Blood enters through ostia.
    Thus, the correct answer is option A.
  • Question 9
    1 / -0
    In the system of cockroach, atrium is a part of 
    Solution

    A small chamber in the respiratory system of cockroach, into which spiracles open is called atrium.

    So, the correct option is ‘respiratory system’. 

  • Question 10
    1 / -0
    How many nerve ganglia are present in cockroach?
    Solution
    A cockroach has 9 segmental nerve ganglia. 3 of which are present in the thoracic region and 6 in the abdominal region. 
    So the correct option is '3 pairs of thoracic and 6 abdominal'.
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