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Structural Organisation in Animals Test - 79

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Structural Organisation in Animals Test - 79
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  • Question 1
    1 / -0
    Which of the following set of organisms have typhlosole in their digestive tract.
    Solution
    An inner fold of intestinal wall of the earthworm and cyclostomes is the typhlosole. This is a teardrop-shaped structure that runs along most of the length of the intestine.  It is essential for increasing the surface area available to absorb nutrients.  
  • Question 2
    1 / -0
    Which one of the following muscles is responsible for moving and shaking the skin?
    Solution
    The panniculus carnosus is a sheath of dermal (skin) muscle, developed in many mammals, that allows the movement of the skin independent of the movement of deeper muscle masses. In humans, the platysma muscle of the neck, palmaris brevis in the hand and the dartos muscle in the scrotum are described as a discrete muscle of the panniculus carnosus. 
    Hence the correct option is C.
  • Question 3
    1 / -0
    Stratum lucidum accumulates a shining substance called
    Solution
    Stratum lucidum - The second layer of the epidermis is a thin, clear layer of dead skin cells in the epidermis named for its translucent appearance under a microscope which is translucent, hence, the name lucidum which means clear. It contains a clear substance eleidin which becomes keratin. This layer is only found on the soles of the feet and palms of the hand.
    So, the correct answer is option D.
  • Question 4
    1 / -0
    The dorsal portion of skeleton found on the abdomen of cockroach is
    Solution
    Cockroach shows the presence of exoskeleton. There are 10 segments in the abdominal region. These segments are absent in the head. The dorsal portion of the segments on the body of the arthropods is called as tergum.  The tergum is made up of calcareous plates called tergites. The portion on the dorsal side forms the terga and the portion on the ventral side form the sternum. 
    So, the correct answer is option C. 
  • Question 5
    1 / -0
    Head of cockroach according to its position is known as
    Solution
    Hypognathous is the type of orientation of insect head. The long axis of the head is vertical i.e., at the right angle to the long axis of the body. The mouthparts point downwards e.g., grasshopper, cockroach etc.
    So, the correct answer is 'Hypognathous'
  • Question 6
    1 / -0
    Plantulae are found in cockroach upon 
    Solution
    Cockroach belongs to Arthropoda and they have joint appendages. Plantulae is found in cockroach upon tarsus. In cockroach, plantulae are useful to walk on smooth surfaces. Tarsus is present as the appendages of a thorax, which has 3 segments. So, the correct answer is option B.

  • Question 7
    1 / -0
    Which are the scientific names of cockroaches?
    Solution
    The American cockroach (Periplaneta americana) is the largest species of common cockroach and is often considered a pest. The oriental cockroach (Blatta orientalis), also known as the waterbug. It is a large species of cockroach. It belongs to the phylum Arthropoda where the body is divided into head, thorax, and abdomen. 
    So, the correct answer is option C.
  • Question 8
    1 / -0
    Number of sternal plates present at the abdomen of female cockroach is
    Solution
    The abdomen consists of 10 segments. In females, the 7th segment is boat-shaped. The 7th sterna together with the 8th and 9th sterna form a brood or genital part. So, the number of sterna present at the abdomen of female cockroach is 7 and in males is 8. So, the correct answer is option B.
  • Question 9
    1 / -0
    Eleidin proteins are found in the layer of mammalian skin, stratum
    Solution
    Eleidin is a clear intracellular protein, which is present in the stratum lucidum of the skin. Eleidin is a transformation product of the amino acid complex keratohyalin.
    Thus, the correct answer is option (B), 'Lucidum'.
  • Question 10
    1 / -0
    A septal nephridium consists of
    Solution
    Septal nephridia are the typical nephridia and is divisible into four parts as:
    a. Nephrostome- Flattened, ciliated with funnel-like proximal end and opens into the coelom by an elliptical aperture.
    b. Neck- Ciliated funnel leads into a short, narrow and ciliated tubule as neck.
    c. Body- Neck is connected to the main body of the nephridium which is divisible into a small straight lobe and a twice larger twisted lobe. The straight lobe continues as distal limb of twisted loop while the proximal limb is formed by the fusion of neck and the terminal duct.
    d. Terminal duct- It is the proximal limb of the twisted loop and is formed at the base of nephridium by the fusion of neck and terminal duct.
    Therefore, the correct answer is option C.

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