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Structural Organisation in Animals Test - 19

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Structural Organisation in Animals Test - 19
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  • Question 1
    1 / -0
    The gas exchange surface in an earthworm is
    Solution
    Gas exchange in earthworm happen through their skin. Earthworm should maintain moist skin so that oxygen from air enters into their capillaries through their skin. Oxygen are carried by their blood to the rest of the body while carbon dioxide is eliminated from the body but it is not carried by haemoglobin.
    Thus, the correct answer is option C.
  • Question 2
    1 / -0
    The skull of frog is 
    Solution
    A skull which is attached to the body by two articulatory condyles is known as the bicondylar skull. Beneath the foramen magnum of frog, there are two occipital condyles. On either side of the foramen magnum, dorsolaterally exoccipital bones are present.
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    A renal portal system is found in

    Solution
    Renal portal system of frog drains blood from hind limbs and posterior part of the trunk and supplies to the kidneys.
  • Question 4
    1 / -0
    Pavement epithelium is another name for
    Solution
    Simple squamous cells have the appearance of thin, flat plates. They have horizontal flattened, elliptical nuclei because of the thin flattened form of the cell. As they consist of a single layer or flattened sac-like cells, it resembles 'pavement' and hence, simple squamous cells are called 'pavement epithelium'.
    Thus, the correct option is C.
  • Question 5
    1 / -0
    Cells of squamous epithelium are
    Solution
    Squamous cells have the appearance of thin, flat plates or they are tile-like. They have horizontal flattened, elliptical nuclei because of the thin flattened form of the cell. They are attached to each other like a mosaic.
    Thus, the correct option is C.
  • Question 6
    1 / -0
    Which of the following is not a part of the small intestine of a frog ?


    Solution
    Stomach is followed by a coiled small intestine made of a small anterior duodenum and much longer posterior ileum. Jejunum is absent in frog.
  • Question 7
    1 / -0
    Contraction of sternohyal muscles during breathing in frog ____________.
    Solution
    Throat is lowered and raised alternatively by sternohyal and petrohyal muscles.
  • Question 8
    1 / -0
    Velocity of conduction of nerve impulse in frog is ________________.
    Solution
    A nerve impulse is the electric signals that pass along the dendrites to generate a nerve impulse or an action potential. Conduction of nerve impulse occurs due to the presence of active and electronic potentials along the conductors. The conduction velocity of the nerve in the frog is 30 m/s. 
    So, the correct option is B.
  • Question 9
    1 / -0
    Simple epithelium is:
    Solution
    Epithelial tissue that is only one cell thick is called the simple epithelium. 
    Simple squamous, simple cuboidal, simple columnar and simple pseudostratified are four types of simple epithelium. 
    Epithelium that is two or more cells thick is called the stratified epithelium. 
    Thus, the correct option is A.
  • Question 10
    1 / -0
    Urethra, vagina and oesophagus have a common inner lining of
    Solution
    Stratified squamous epithelium consists of epithelial cells arranged in layers upon a basal membrane. There are no intercellular spaces, so this type of epithelium is well suited to the areas in the body which are subjected to constant abrasion. It is the thickest layer and can be sloughed off and replaced before the basement membrane is exposed. It forms the outermost layer of skin and the inner lining of the mouth, oesophagus, urethra and vagina. Thus, the correct answer is option D.
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